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Serge Ibaka isn't going anywhere, nor should he. Kendrick Perkins, on the other hand...
Perkins had a horrid postseason. Like, historically bad.
He closed out the playoffs averaging just 2.2 points and 3.7 rebounds on 27 percent shooting. Which is where the history came in. Perkins is the only player in NBA history to close out his postseason logging at least 19 minutes a night through 10 or more games and average fewer than three points on under 30 percent shooting.
Congratulations, Kendrick—you're in a class all your own (though Jason Kidd is on pace to join you). Of course, Perkins is in for defensive purposes, so this is all irrelevant—just like he was on defense.
Oklahoma City's defense actually allowed more points per 100 possessions with him on the court during the postseason. And just for kicks, the Thunder offense was 17.2 points per 100 possessions better with him off the court.
What the Thunder need is a big man who can play at their pace and protect the rim like they're supposed to. They also need someone who is offensively savvy. In other words, someone who is not Perkins.
Ibaka emerged as a consistent source of offense during the regular season (career-high 13.2 points per game), but he doesn't have much of a back-to-the-basket game. A big with more refined low-post sets would open up lanes for Kevin Durant and Russell Westbrook even more, while also creating more three-point opportunities for Oklahoma City's wings.
Perkins' contract will prove difficult—if not impossible—to move, though. He's owed roughly $17.5 million over the next two seasons. The Thunder obviously don't have to trade him, but signing a capable big man for pennies on the dollar isn't much of a realistic option.
Regardless of what it takes, however, the Thunder must correct their Kendrick Perkins problem.