Graeme Lloyd. Since his longtime uniform number #21 was in use by teammate Paul O'Neill, Clemens initially wore #12, before switching mid-season to #22. During the 1999 regular season, Clemens posted a 14–10 record with a 4.60 ERA. He logged a pair of wins in the postseason, though he lost Game 3 of the 1999 ALCS in a matchup against Red Sox ace Pedro Martínez, which was the Yankees' only loss in the 1999 playoffs. Clemens won the Yankees' Game 4 clincher over the Atlanta Braves, giving up only one run in innings. Clemens followed up with a strong 2000 season, in which he finished with a 13–8 record with a 3.70 ERA for the regular season. Though Clemens lost two games in the ALDS against Oakland, the Yankees won the other three and thus advanced. In Game 4 of the ALCS against Seattle, Clemens set the ALCS record for strikeouts in a game when he fanned 15 batters in a one-hit shutout. In Game 2 of the 2000 World Series, Clemens pitched eight scoreless innings against the New York Mets. In 2001, Clemens became the first pitcher in MLB history to start a season 20–1 (finishing 20–3), and won his sixth Cy Young Award. Clemens started for the Yankees in Game 7 of the 2001 World Series against the Arizona Diamondbacks, where he dueled Curt Schilling to a standstill after 6 innings, yielding only one run. The Diamondbacks went on to win the game in the 9th. Early in 2003, Clemens announced his retirement, effective at the end of that season. On June 13, 2003, pitching against the St. Louis Cardinals in Yankee Stadium, Clemens recorded his 300th career win and 4,000th career strikeout, the only player in history to record both milestones in the same game. The 300th win came on his fourth try; the Yankee bullpen had blown his chance of a win in his previous two attempts. He became the 21st pitcher ever to record 300 wins and the third ever to record 4,000 strikeouts. His career record upon reaching the milestones was 300–155. Clemens finished the season with a 17–9 record and a 3.91 ERA. The end of Clemens's 2003 season became a series of public farewells met with appreciative cheering. His last games in each AL park were given extra attention, particularly his final regular-season appearance in Fenway Park, when despite wearing the uniform