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Jorge De La Rosa.
Kevin Correia (Minnesota Twins)
He signed a two-year, $10 million deal in December. Across the baseball world, there was a consensus that Minnesota overpaid.
In nine short months, Correia has progressed from whiny long man (via Rob Biertempfel, Pittsburgh Tribune-Review) to serviceable American League starter. The .659 OPS against him is lower than it's ever been, and a 3.25 strikeout-to-walk ratio deserves praise.
Jorge De La Rosa (Colorado Rockies)
Setbacks during De La Rosa's recovery from Tommy John surgery delayed his 2012 debut until the third week of September. Then, the former rotation leader pitched poorly in his only three starts (0-2, 9.28 ERA, 1.78 WHIP).
Despite limited appearances against major league hitters in spring training, the early regular-season results are impressive. De La Rosa will carry a 2.86 earned run average into his final April outing.
Then again, all but one of his assignments have been away from the high altitude and high-scoring conditions of Coors Field.
Ervin Santana (Kansas City Royals)
Unheralded reserves (like Trayvon Robinson), reputable sluggers (including Prince Fielder) and everybody in between teed off against the right-hander one summer ago. Santana gave up 39 total home runs and the Los Angeles Angels had no choice but to dump his salary.
He was previously effective, with WAR values of 3.0 or better in 2008, 2010 and 2011 (via Baseball-Reference.com), though this sort of rebound puts him on pace for a career year.
After five starts, he's a top-10 AL pitcher in terms of IP (36.0), ERA (2.00) and WHIP (1.00)