Some deals involve bigger names than others. Some players acquired just before the trade deadline have made a huge impact on the regular season and/or the postseason, and others may have contributed with one really important play, such as David Roberts' stolen base in Game 4 of the 2004 ALCS.
Down 4-3 in the ninth inning and three outs away from being swept by the New York Yankees, Kevin Millar drew a leadoff walk against future Hall of Famer Mariano Rivera. Inserted as a pinch runner, Roberts stole second—his lone stolen base of the postseason—and later scored on an RBI single by Bill Mueller to tie the game at four. The Boston Red Sox won, 6-4, on a walkoff homer by David Ortiz three innings later.
The win allowed the Red Sox's postseason to continue. They won seven straight games and were world champions for the first time since 1918. If not for the seemingly minor acquisition of the 32-year-old Roberts (from the Los Angeles Dodgers for minor league outfielder Henri Stanley) on July 31, that magical season could've ended with a four-game sweep at the hands of the rival Yankees.
Here are nine more of the greatest deadline deals that turned out to be winners for the contending teams that made them.