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OAKLAND — The apathy seems evident in Klay Thompson’s tone, body language and reluctance to talk.

“No big deal,” Thompson said.

So leave it to Warriors forward Draymond Green to express the sentiment felt among Thompson’s teammates, his coaches and those around the NBA.

“He doesn’t get enough respect for his defense,” Green told The Bay Area News Group. “But his defense is a key part of what we do.”

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What does Thompson do on defense? Not much, other than fulfill almost every responsibility imaginable.

“He just chases the ball all day long,” Warriors coach Steve Kerr said. “Klay never gets tired. He guards point guards for us and then he switches onto four men. Then he guards the post. Then he runs around the other end like he’s Reggie Miller. There’s stamina, strength and ability to play on both ends.”

The Warriors argued Thompson’s defense has factored significantly in winning two NBA titles in the past three years. They have not factored strongly enough, though, for Thompson to make an All-NBA Defensive team through his first six seasons.

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“That’s some BS,” Boston Celtics guard Kyrie Irving said of Thompson’s omission. “I guess you could say he’s underrated.”

Others say the same thing, including a proud father whose strong opinions on this topic stem from being a former NBA player who saw his son cement his defensive foundation during childhood.

“It baffles me. Obviously the people who vote just aren’t paying attention,” said Mychal Thompson, a former member of the Los Angeles Lakers’ Showtime teams and an analyst for the Lakers’ flagship radio station. “I am shocked in the last three years that he hasn’t been on one of those teams. I don’t get it. I don’t understand it.”

NBA TV analyst and Hall of Fame point guard Isiah Thomas does, saying, “The players don’t vote.”

“He doesn’t play to the fans and media judges. He plays to the players’ judgment. That’s why we all love him,” Thomas said. “That’s why we all respect him. There isn’t a former player or current player, when we talk about guys who can play defense, where Klay and Kawhi Leonard’s names don’t come up first.”

Thompson’s name has not come up when media members vote for the NBA’s All-Defensive first and second teams. Kerr dutifully noted, “He deserves it, but I don’t know who else is on the team and who you would take off.”

And yet, Thompson spoke pragmatically to The Bay Area News Group about his place among defenders that might explain his exclusion.

“I don’t average the sexy stats. I don’t get a lot of blocks or steals. I’m solid,” said Thompson, who ranks 147th in the league in steals (0.7) and 95th in blocks (0.53). “I’m just known for my shooting and offensive prowess. But on the defensive side of the ball, I haven’t gotten the same recognition, which is fine.”

Why is that fine?

“If I do right, I’ll get it in due time,” Thompson said. “It’s no big deal.”

Honing his craft

Those on the Warriors believe that Thompson’s low-key personality partly contributes to his exclusion from All-Defense recognition. They also note that he already assumes a relatively lower profile than his teammates on offense (Stephen Curry, Kevin Durant) and defense (Durant, Green, Andre Iguodala). Thompson conceded those factors have influenced his exclusion “probably a little bit.”

“We think he’s great as coaches, but he’s just not a guy that is going to go out, make waves and promote himself,” Warriors assistant coach Ron Adams said. “He has an inner peace to him and an inner calm about him that I think has been very gratifying for me to be a part of. That’s the kind of player I really respect. He lets the game speak for itself.

“Perhaps he doesn’t get the credit he deserves. But that’s a phrase I don’t like to use at this level. Some things are evident. His play is evident to all of us and to any basketball fan who understands the game.”

Do not let Thompson’s apparent apathy fool you, though. As Mychal Thompson said, “He tries to let everything roll off his back, but he would like to be on an All-Defensive team.”

That is not surprising. Klay Thompson quickly realized the importance of defense at an early age.

When he played at Santa Margarita Catholic High in Orange County, Thompson guarded future NBA stars James Harden (Artesia) and DeMar DeRozan (Compton). Thompson credits his high school coach, Jerry DeBusk, for forcing him to work on team defense, rotations and closeouts during every practice.

Then during his freshman year at Washington State, Thompson found former coach Tony Bennett to be “the most defensive-minded coach in the country.” Thompson said Bennett spent nearly every practice teaching him more on how to use his length on closeouts, how to rotate off the ball and how to excel in team defensive schemes.

Throughout this time, Mychal Thompson often stressed to Klay about taking defense seriously to diversify his game and to maximize his chances for playing time.

“I had a great foundation,” Klay Thompson said. “I knew how to see the ball and knew how to close out perfectly on both sides of the floor. I knew the basic fundamentals. It’s as simple as it sounds. But it goes a long, long way when you know how to do it the right way.”

That mindset gave Thompson extra currency when the Warriors selected him with the No. 11 pick in the 2011 NBA draft.

“When we drafted Klay Thompson, no one said he was going to be a good two-way player. We drafted him because of his shooting,” said Nuggets coach Mike Malone, a former Warriors assistant (2011-13). “That was the great thing about Klay. He quickly established himself as a guy that wanted to play on both ends of the floor.”

Defensive moments

Despite his son’s mindset, a normally confident Mychal Thompson recalled feeling “really nervous” leading into a Jan. 6, 2012 Warriors-Lakers game. Klay played against Kobe Bryant, his childhood idol, for the first time as a rookie. Beforehand, Mychal Thompson dreaded what he would see from the broadcast booth.

“Kobe just destroys young players,” Mychal said. “I thought for sure Klay would get baptized against Kobe.”

Indeed, Bryant posted 39 points while shooting 13 of 28 from the field. But most of Thompson’s teammates were assigned to Bryant. Thompson kept asking the Warriors coaching staff if he could guard Bryant whenever possible. As Mychal Thompson noted, “Klay competed against him very well defensively and didn’t look overmatched.”

“My biggest lesson I learned from Kobe is not to jump for any pump fakes,” Klay Thompson said. “He had a lethal pump fake. He probably got every single person in the NBA with it.”

Despite that insight, Bryant still averaged 28 points in 12 head-to-head matchups against Thompson. Still, Bryant shot only 41.1 percent during those games. Thompson also applied his experience guarding Bryant toward other players with better success.

In the 2013 Western Conference semifinals, Thompson helped hold Spurs guard Tony Parker to inefficient shooting performances in Game 4 (6 of 17) and Game 6 (3 of 16). Durant, then with Oklahoma City, watched on television feeling pleasantly surprised.

“I didn’t know Klay could play defense like that,” Durant said. “After that, I just gained so much respect for him.”

The respect kept growing. Durant has noticed that Thompson had more relative success than most while defending Thunder guard Russell Westbrook. Westbrook has shot 41.1 percent in 22 regular-season head-to-head matchups against Thompson, while going 39.5 percent in seven postseason meetings.

“Russ usually had his way against guards that were smaller than him. But you put a 6-foot-5, 6-foot-6 dude on him, it just made it tougher for him,” Durant said of Thompson. “I’m not saying Klay is a total lockdown (defender) and closes everything down. That’s hard to do in this league. But he makes it tough on you and he makes you shoot tough shots.”

The Warriors’ coaching staff and other NBA coaches, including Houston’s Mike D’Antoni, the Clippers’ Doc Rivers, Utah’s Quin Snyder and Minnesota’s Tom Thibodeau, offered a similar scouting report on Thompson’s defense.

They mentioned that Thompson’s listed 6-foot-7, 215-pound frame gives him superior length and strength than most guards he defends. They also praised Thompson’s quick hands, efficient footwork and lateral quickness. As one NBA scout said, “Klay is in the right place at the right time. He seems to know what his guy is going to do.”

“He’s not a gambler. So many times we perceive good defense or we judge good defense by how many steals you get or how many blocks you have. That’s not necessarily good defense,” Thomas said. “That’s a result of gambles and recovering from probably bad defensive plays. Klay is solid. He doesn’t reach a lot. He doesn’t gamble. He makes you take tough shots. He understands the true essence of defense is making somebody miss, not necessarily getting a steal or blocking a shot.”

That seems like a hard task considering Thompson has guarded various top backcourt players, including Bryant, Parker, Westbrook, Irving as well as Houston’s Harden and Chris Paul.

“It’s been unique to how you have to defend each player,” Thompson said. “You have to study a lot of basketball.”

Beyond Thompson’s persistent film study, his father has noticed his son carrying another positive attribute that helps Thompson become a figurative speed bump against elite NBA guards. Mychal Thompson often reminds Klay in a half-serious, half joking tone that he has remained blessed with superior genes from his mother, Julie, who played college volleyball. This season, the Warriors have praised Thompson for arriving into training camp in superior shape, which he attributed toward improved disciplined dietary habits and offseason workouts.

“If his conditioning wasn’t at the level it was at now, there would be no way he can guard our opponent’s best perimeter offensive player and still do what he does on the offensive end,” Warriors assistant coach Mike Brown said of Thompson. “It would be impossible because he exerts a lot of energy.”

The Warriors have liked how Thompson has channeled that energy. Consider Adams’ explanation for why he considers Thompson a “very consistent defender.” Said Adams, “He’s just basically relentless; he doesn’t get deterred.”

As a result, many Warriors remember Thompson’s defense on Irving in the 2017 NBA Finals against Cleveland.

“There were games Klay locked him up,” Green said, grinning. “There were games Kyrie got the best of Klay.”

Irving got the best of Thompson leading up to that series. Irving made a turnaround jumper that sealed the 2016 Christmas Day matchup. Thompson had Irving covered tightly, but he showed his resiliency when the teams met again last June.

In the 2017 NBA Finals, Irving experienced scoring highs — 24 points in Game 1, 38 in Game 3 and 40 in Game 4 — as well as shooting lows — 34.8 percent in Game 2 and 40.9 percent in Game 5. In Game 1, however, Thompson held Irving to 1-of-6 shooting when he guarded him, while also holding Kevin Love to 0 of 4. Despite Irving’s strong play in Game 3, Thompson held Irving to 2 of 6 in the fourth quarter.

Through it all, the Warriors marveled that Thompson stayed calm through success and adversity.

“You’re not going to stop him for four straight games. It’s just unrealistic,” Thompson said of Irving. “All you can do is frustrate him and make him work as hard as he possibly can for every bucket. You’re playing a five-, six- or seven-game series. By the time it’s that seventh game, hopefully it will finally wear on him.”

The Warriors said they have never seen that process wear on Thompson, though. Even when he shot 5-of-16 from the field on Feb. 24 against Oklahoma City, Thompson still forced Thunder forward Paul George to a 1-of-14 clip. Four days later, Thompson limited Washington guard Bradley Beal to a 3-of-15 mark.

Therefore, Brown recalled he only notices Thompson slump his shoulders in frustration when the coaching staff occasionally instructs someone else to guard the opposing team’s best perimeter player.

“He wants to take on the challenge,” Brown said. “Not one time have I ever seen him back away from wanting to take the guy that makes the most plays for our opponent.”

Guarding bigs

Therefore, Brown has plenty of material to share with the players during film sessions that does not just involve Thompson locking down perimeter scorers, forcing contested shots or making the correct rotations. Brown often edits clips that show Thompson guarding frontcourt players. He does this to praise and tease Thompson.

“I don’t know why Klay thinks he’s Mr. Universe or all that other stuff with his muscles and strength,” Brown said, laughing. “He loves when he switches onto bigs.”

Thompson has routinely covered Detroit’s Blake Griffin and Cleveland’s Love and LeBron James. Thompson has spent his offseason and practice days working on his upper and lower body so he can handle such assignments. He has dismissed Brown’s playful jabbing as “being a good old-fashioned hater.”

“Mike doesn’t think I can guard anybody in the post, but he’s a hater,” Thompson said. “He thinks I’m too skinny or something.”

So any time he makes a defensive stop on a frontcourt player, Thompson brags about the play to Brown. And when Thompson does not?

“Sometimes he ends up switching on bigger guys with power forwards and centers, but I don’t like it as much as I like him on the perimeter,” Warriors center Zaza Pachulia said. “Sometimes when he would lose his guy on a backdoor, I’ll get on him. He knows I don’t mean it. He’s my guy.”

That rarely happens, though. The lone exception: Thompson said he has only felt overmatched when he defended Milwaukee Bucks forward Giannis Antetokounmpo.

“He’s so long I cannot stop his jump hook,” Thompson said of the 6-foot-11, 222-pound Antetokounmpo. “He’s stronger than he looks. That’s the one time I felt I don’t have an answer for this guy.”

Getting the recognition

Thompson said he will continue to work for those answers. He wants to average more steals. He wants to maintain his tendency to avoid fouls (1.6 per game) after averaging more than two per contest his first three seasons. He wants to improve his awareness level on off-ball defense.

The reason? Despite his calm exterior through his defensive successes or failures, Thompson becomes livid internally any time someone scores on him.

“He takes defense personally,” Adams said. “I love him for that.”

The Warriors also love that Thompson does not take it too personally that he has not been recognized with an award for his defensive prowess. Nonetheless, Thompson has an extra source of motivation amid his quest to win his third NBA championship.

“People watch the regular season, but people always tune in during the playoffs,” Thompson said. “They want to see what you do on the biggest stage. That’s when I’ll try to bring it. I try to bring it every night. But I really try to lock in for 16 (playoff) games.”

Then, Thompson stood up and indicated he felt he spoke enough. Once again, he hoped his play would speak louder than his words.

*Staff writer Melissa Rohlin contribiuted to this report.