Evan Longoria is no stranger to All-Star snubs. In 2011, the Tampa Bay Rays third baseman led all players at his position in Wins Above Replacement, despite not being picked to play for the AL team. In 2013, another non–All-Star season, he ranked third in WAR at third base. Both years resulted in top-10 MVP finishes. His All-Star absences in 2014 and 2015, though — those non-selections weren’t snubs. Longoria wasn’t one of 81 All-Stars in 2014, or one of 76 All-Stars this season, because it’s been a while since he’s looked like one of baseball’s best players.

It wouldn’t be accurate to call Longoria’s last couple of years a collapse. He is still an above-average hitter and above-average fielder who has played more games than any other major leaguer over the past season-plus. But compared to his previous superstar standard, Longoria’s rate of production has undergone a decline that not even his ample playing time can obscure. By FanGraphs WAR, Longoria was the best player in baseball from 2008 to 2013, at any position. Since 2014, though, he’s been the 11th-best player at third base alone, behind not only a new breed of blue-chippers, like Manny Machado and Nolan Arenado, but also lower-profile contemporaries like Justin Turner and Trevor Plouffe.

This season, Longoria’s 2015 batting average and on-base percentage (.276/.350) are almost identical to his career averages, as are his walk and strikeout rates. His problem is depleted power. Longoria’s Isolated Power (SLG-AVG) took a noticeable dip last season, and it has fallen further this year:

Season ISO 2008 .259 2009 .245 2010 .213 2011 .251 2012 .238 2013 .230 2014 .151 2015 .138 2008-13 .237 2014-15 .146

Longoria is one of only 92 players in MLB history to post six consecutive seasons with an ISO over .200 in at least 300 plate appearances. Of those 92, only one, Philadelphia Athletics left fielder Bob Johnson, followed such a streak with back-to-back seasons of at least 300 PA and an ISO below .160, as Longoria appears poised to do. Relative to what it was over his first six seasons, Longoria’s 2014–15 Isolated Power is off by almost 100 points, a decrease that can be pinned only partly on a leaguewide drop in run scoring. After accounting for the offensive environment, Longoria was about 35 percent better per plate appearance than a league-average player from 2008 to 2013. Since then, he’s been about 10 percent better over more than 1,000 PA. That difference, coupled with an inevitable drop-off from the stellar defensive stats of his first few seasons, has turned him from a franchise player into merely a very good one, and his high line-drive rate and BABIP don’t foretell better bounces to come.

Rays hitting coach Derek Shelton wonders whether Longoria’s ballpark is partly to blame. “Even though he’s played his whole career at Tropicana Field, the last probably three years it’s not been really conducive for the homers,” Shelton said. “He’s hit some balls into the left-center-field gap that would probably be homers in other places and were probably homers a few years ago at the Trop. For some reason, the ball’s just not traveling the way it used to.”

Shelton acknowledges that there hasn’t been any structural change to the Trop that could account for the dome playing dramatically differently. Nor is there any evidence of a 2014 dead zone in left center in the yearly park factors (scaled to an MLB average of 100) calculated by Tony Blengino, a former Brewers and Mariners analyst who now writes for FanGraphs. These values fluctuate significantly from season to season, but if anything, they show the Trop becoming a friendlier place for fly balls.

Direction 2012 2013 2014 LF 96.0 88.4 93.7 LCF 76.5 78.7 82.6 CF 64.4 82.8 53.8 RCF 80.3 100.6 98.8 RF 62.3 133.4 107.5

It is true that Longoria’s greatest decline has come on balls hit anywhere but down the left-field line. While his pull power on line drives and fly balls has suffered, his ISOs to center and the opposite field have been cut more than in half. At this point, he only has pull power.

Direction 2009-13 ISO 2014-15 ISO % Decline Far left .925 .733 20.8 Left center .653 .370 43.3 Dead center .267 .134 49.8 Right center .357 .100 72.0 Far right .223 .126 43.5 Left .867 .623 28.1 Center .332 .147 55.7 Right .256 .111 56.6

In light of those numbers, it’s hard to escape the conclusion that Longoria is making softer contact. Indeed, his average batted-ball velocity, according to Sportvision’s HITf/x system (which reports lower figures than Statcast), fell from over 85 mph in each of his first two big league seasons to 81.0 in 2014. And his average batted-ball distance on fly balls and home runs has sunk from 300 feet or more from 2008–09 to about 280 feet from 2014–15. There’s no smoking disabled-list stint that would explain those stats. Longoria’s only reported injury in 2014 was a bout of forearm soreness that didn’t keep him off the field. This year, he suffered a sore wrist that cost him a few games in early June.

“As has been documented, he’s battled through some things injury-wise,” Shelton said. “That probably is the biggest contributing factor, because of how tough Longo is. He never wants to come out of the lineup. There may be some times where he sacrifices a little bit of power, but to his credit, he does what’s for the betterment of the team and not necessarily for himself. You see guys that put up heavier power numbers, they take days off. I think he had a streak this year [that ended when] he took a day off when he was sick. He could barely move, and he still tried to play.”

For Tampa Bay, even a diminished Longoria is much better than the alternative: Most of the Rays’ non-Longoria starts at third base this season have gone to Jake Elmore, who’s hitting .213/.272/.303. On the other hand, a little more Elmore would be worth having if it meant getting the old Longoria back the rest of the time. That is, if the solution were as simple as a few extra days off.

It’s possible that as the Rays have fallen out of the playoff hunt and been in the bottom half of MLB offenses over the past two seasons, for the first time in Longoria’s career, the ex-slugger has violated the sacred clichés of “staying within oneself” and “trying not to do too much.” His overall swing rate and his swing rate at pitches outside the strike zone reveal a much more aggressive approach from 2014-15, reversing a multiyear trend toward greater discipline.

As the Rays’ resident star, Longoria might be putting more pressure on himself in an attempt to make up for injuries to John Jaso and James Loney and ugly slash lines from Rene Rivera and Asdrubal Cabrera. “I think that can be a contributing factor for all players, especially when you have a franchise player, especially this year with the aggressiveness and maybe being outside of the zone a little bit,” Shelton said. “I think at times when you lose other offensive players, guys try to do a little bit more.”

Shelton declined to comment on any changes Longoria has made at the plate, or on any tweaks he’s trying to implement now, saying, “We never talk publicly about what we’re doing mechanically.” Hitting mechanics are notoriously tough to critique, but I asked hitting coach and Baseball Prospectus swing analyst Ryan Parker to search for any sign of a change sapping Longoria’s strength. “The one thing that jumped out at me was how he used to use his lower body compared to now, and the effect that has on how his hands move,” Parker said.

Here’s a video of two Longoria homers to left on pitches over the center of the plate. The homer on the left is from 2013, and the one on the right is from 2015.

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“In 2013, his front hip would get well out in front of his body,” Parker said. “This position primes the big muscles in his hips and legs to whip the top half of his body to the ball. In 2015, that angle isn’t as aggressive, so he hasn’t tapped into the same muscles to help power his swing.”

Parker also notes that Longoria “has pushed his hands forward compared to the still behind-his-back shoulder location of his 2013 swing.” In 2013, he says, Longoria “could save the strength in his upper body to drive through the baseball because his legs did all the work early in the swing. In 2015, his legs aren’t helping him drive his swing as much, so he has to push his hands to the ball, which is a less powerful movement pattern.”

In the following GIF of a 2013 Longoria homer, Parker sees the hitter’s hips acting as a hinge, with his shoulders closer to his knees than they are in the subsequent GIF of a 2015 homer, in which Longoria stays upright longer.

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To my untrained eye, those differences seem slight, bordering on undetectable. To Parker’s, they’re significant but fixable. It’s possible, though, that any mechanical adjustment Longoria has made is an attempt to compensate for a loss of bat speed, which slows inexorably with age.

Each summer since Longoria’s rookie season, FanGraphs’ Dave Cameron has ranked MLB players by trade value. Longoria was the runaway star of the first four years of that exercise, combining almost unparalleled present value with a below-market salary that the Rays wisely secured with an extension signed less than a week after Longoria’s big league debut.

Season Trade Value Rank 2008 1 2009 1 2010 1 2011 1 2012 4 2013 5 2014 9 2015 Unranked

As late as last summer, Cameron included Longoria in the top 10. This year, though, the third baseman has fallen out of the top 50, reflecting both his declining performance and his escalating pay. Between a subject who won’t talk about injuries and a hitting coach who won’t discuss mechanics, it’s not easy to unravel Longoria’s recent past, let alone his future beyond his 30th birthday, which he’ll celebrate (or maybe mourn) in less than three months. But his quick transition from “franchise-altering asset” to “pretty good deal” is a reminder of the relatively short shelf life of a bargain-basement superstar.

Thanks to Rob McQuown of Baseball Prospectus for research assistance.