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When the Mets added Beltran, they went from 71 wins to 83 - but I wouldn't give credit to Beltran for that. He was actually a step down from Mike Cameron. But Cammy only played half a season with Beltran, so no doubt a healthy Carlos was important to their improvement.
But more importantly, adding Beltran moved the Mets from 3 straight losing seasons to a series of pennant contending seasons. Three straight losing seasons to four straight winning seasons. Beltran was an important part of that.