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During the late 90s and early 00s Nomar looked like a perennial all-star and a future Hall-of-Famer who might hit .400 one day. From 1997-2000, he batted .337/.386/.577 and averaged 44 doubles and 28 home runs a year.
Oh, how times have changed.
It started when Nomar injured his wrist late in the 2000 season, and he was never the same after. 90% of pre-injury Nomar was still a solid player, though once he was included in a proposed deal for Alex Rodriguez after the 2003 season, his relationship with Sox management suffered.
Nomar sulked for most of his 2004 season with the Sox, when he missed a number of games to injury. He famously sat on the bench while the rest of his teammates were on the dugout steps in a pivotal July game against the Yankees; you may remember it as the game when Derek Jeter made his infamous catch running into the stands.
His poor attitude combined with below average defense at shortstop caused the Red Sox to trade him, along with prospect Matt Murton, in a four team deal that netted them Orlando Cabrera and Doug Mientkiewicz.
The trade worked: the Sox were 56-46 before the deal, and 42-18 after. They went on to defeat the Yankees in a historic comeback from three games down in the ALCS, and swept the Cardinals to end their 86-year World Series drought.