A lot changes in a quarter-century. Just ask Roger Clemens. Exactly 25 years ago today, the Rocket made history by striking out a record 20 Seattle Mariners in nine innings. Although his reputation, Hall of Fame status, and other uhh...physical attributes (II) may have changed, the feat still was one of the most dominant performances in sports history. Clemens' athletic display ranks up there with Wilt Chamberlain's 100-point game, Mark Messier's 1994 Eastern Conference Finals hat trick, and Adrian Peterson's 297-yard single-game rushing record. So, in honor of the anniversary, from MMA to the NBA, here are the 25 Most Dominating Single-Game Performances in Pro Sports History.