It hasn't been easy being a Buster. Think about it: Busters are usually pets, mostly dogs, and sometimes you're asked if you're housebroken. People shout, "Hey, watch it, Buster!" as if they're the first to think of it.

Posey took MLB by storm this season, helping the Giants to a World Series victory. Alan Clarke for ESPN The Magazine

So when a guy like San Francisco Giants catcher Buster Posey comes along, he gives the rest of us Busters some street cred. Which is why I wanted to thank him the first time we spoke last June. But as soon as I heard his voice over the phone, I changed my mind. He sounded extremely serious, greeting me with an abrupt "Hello." His no-nonsense tone suggested that bonding about our name wasn't going to work.

Instead I asked about his game preparation. It's what Posey spends most of his day thinking about, meticulously studying film and poring over scouting reports. That's one reason he made it to the bigs as quickly as he did. In 2009, his one full season in the minors, he posted a .947 OPS between Class-A and Triple-A and earned a September call-up. He was promoted for good last May 29 and ripped three hits in his first start of the season, which was just a glimpse of what was to come. At age 23, Posey hit .305, blasted 18 homers and handled baseball's best pitching staff with the savvy of a veteran. In November, his season ended in a champagne celebration. Two weeks later, he was named National League Rookie of the Year.

Posey is the rarest of breeds, a catcher who can field his position with ease and swing the bat with the best. His position lacks the hey-look-at-me factor of other up-the-middle spots on the diamond, but if you watched Game 4 of the NLCS, you know that Posey can do special things. He went 4-for-5 with two doubles, each of his hits coming on a different pitch type -- fastball, curve, slider and changeup. Meanwhile, he stayed focused behind the plate. In the fifth inning, he scooped a short-hop throw from centerfielder Aaron Rowand to tag out Phillies' catcher Carlos Ruiz on a bang-bang play at the plate. The deft maneuver preserved a one-run lead in an eventual 6-5 Giants win. Posey, who's 6'1", and 205 pounds, gunned down 37.1 percent of attempted basestealers in 2010, fifth-best among catchers with at least 75 games caught.

He has become San Francisco's first homegrown superstar position player since Matt Williams. And at least one veteran scout, who saw him hit for the first time this past June, immediately compared him to another righthander: Albert Pujols. "His approach at the plate is that good," says the scout. "If you throw him a fastball, he drives it to the opposite field. If you throw him a breaking ball, he'll pull it. He doesn't swing at pitches out of the strike zone." Many hitters swing early in the count, because they don't want to fall behind the pitcher. "But the thing about Buster is he's not afraid to hit with two strikes," says Giants manager Bruce Bochy. Posey hit .257 with two strikes this past season, which was ninth-best in all of baseball.

All this success makes it hard to believe he took up catching just four years ago. At Lee County High, in Leesburg, Ga., Posey played shortstop and pitched, but he stood out most on the mound. Before his senior year, he pitched in the World Junior Championship on a Team USA squad that featured future big leaguers Andrew McCutchen (Pirates), Ike Davis (Mets) and Justin Upton (Diamondbacks). He was named the Georgia Gatorade Player of the Year the next spring and graduated fourth in his class with a 3.938 GPA. "My parents set high standards," says Posey, who picked up his nickname from his father, who was known as Buster in his youth. "It wasn't okay if you got a B. You should shoot for high standards, and believe they're obtainable."

As a freshman at Florida State, Posey played only shortstop. But during the fall of his sophomore year, Seminoles assistant coach Meat Martin, son of FSU coach Mike Martin, had an idea: Put Posey at catcher. It might be the best thing for him in the long run, Meat said, because he wouldn't have the foot speed to stay at shortstop as a pro. Mike Martin was skeptical. Posey was an All-America shortstop, and Meat wanted to make him a catcher?

It wasn't completely insane. FSU had a hole at catcher and another excellent shortstop in Mark Hallberg (now a D-backs farmhand). So Mike Martin figured he'd at least see the kid catch a few from the crouch. That meant 85 fastballs. "He caught every one," Martin says, "as if he'd been doing that his whole life."

Posey -- who played all nine positions in a game as an FSU junior -- made the switch from short to catcher seamlessly. He was a finalist as a soph for the Johnny Bench Award, given annually to the college game's best backstop. Then he won it in 2008, after hitting an out- rageous .463 with 26 homers in 68 games. Fitting, because Posey might be the best all-around catcher since the award's namesake.

As with quarterbacks, catchers usually take years to develop. Their skills are refined through repetition, like framing pitches to coax an umpire into calling a strike, or blocking balls in the dirt. It also takes time for a backstop to develop a rapport with pitchers. Some young catchers can defer too much, while others are too pushy and take it personally when a pitcher shakes off a sign. And yet Posey immediately demonstrated to the San Francisco pitchers that he was prepared but not overbearing. "You try to get a feel for each guy," he says. "For example, what are they throwing in a 2-1 count against a great fastball hitter? I tried my best to make them confident in what I was doing, knowing each guy is going to be different."

The pitching staff took notice. "You want your catcher to be unafraid and assertive," says righthander Matt Cain. "He was not afraid to jump right in. He just wanted to get it right."

As I learned in our June phone call, Posey is serious about his baseball. So serious that, by the end of the season, Bochy found himself at ease seeking the rookie's insight into how the pitcher on the mound was faring. Never was this more evident than in Game 3 of the World Series. Enigmatic lefty Jonathan Sánchez was on the hill, clearly gassed at the end of a long season. After Sánchez gave up a three-run homer in the second inning to Rangers first baseman Mitch Moreland, Guillermo Mota began warming up in the bullpen. But Posey believed he could coax a few more innings out of the southpaw. Chatting in the dugout between innings, Posey and Sánchez talked about how to proceed without the pitcher's best fastball. "In that situation, you're telling him, 'This is not out of hand, just keep it right here,' " Posey says. "He made adjustments. From the third inning on, we went away from the fastball."

Instead of relying on the heater, a pitch Sánchez threw 65 percent of the time during the regular season, Posey called for off-speed stuff more than 60 percent of the game. He basically turned Sánchez into a junkballer for the rest of the night. Amazingly, the pitcher managed to make it into the fifth, allowing just one more run. It was the Giants' lone loss of the Fall Classic, but the bullpen was saved from six innings of mop-up duty, keeping the relievers fresh for the rest of the series.

Posey has been developing those preter- natural leadership skills for years. As an FSU junior, he was standing by his locker after a tough loss when a freshman teammate shot a grin toward another Seminole. Mike Martin happened to see it and asked, "What's so funny?" As the freshman started to explain, Posey turned and stared at him. "Shut up!" Posey snapped. "Just shut up!" Martin walked out of the room. Posey had done his job for him. The catcher led the Seminoles to the College World Series that June, and then, after signing with the Giants as the fifth overall pick, he received a $6.2 million bonus. Soon after, he walked into Martin's office and handed him a check for $50,000 -- a gift to the Noles baseball program.

When the new players arrived at school the next fall, Martin left Posey's locker untouched, with the nameplate in place. No player better represented the Florida State program, and Martin wanted future generations to follow Posey's lead. It wasn't long after the World Series that Posey was introduced at a Florida State football game, and it occurred to Martin, as he listened to the explosion of cheers, that he'd never heard any Seminoles player, in any sport, greeted so loudly.

I could almost hear Posey's smile two weeks later, when he called around Thanksgiving. He sounded a lot more relaxed than the first time we spoke. The blur of the World Series was behind him; he'd just returned home to Georgia from a vacation with his wife, Kristin. "Hey, Buster," he started. "It's Buster." He paused, and added with a chuckle, "How many phone conversations do you think have started like that?"

Better enjoy the jokes now. Buster will be getting serious again real soon.

Buster Olney is a senior writer for ESPN The Magazine.