ERA (2.90), and sixth in innings pitched (). Considered for the Cy Young Award, Loaiza finished second behind Roy Halladay, ahead of Pedro Martínez and Tim Hudson. Loaiza's 21 wins in 2003 are tied for the most ever in a season for a Mexican pitcher; Fernando Valenzuela won 21 games in 1986. In 2004, Loaiza was selected to his second All-Star Game as a member of the White Sox. New York Yankees Soon after his appearance in the All-Star Game, Loaiza was traded to the New York Yankees on July 31 for José Contreras. He did not perform well in New York, recording a 8.46 ERA in six August starts, and was moved to the bullpen during the final month of the regular season. During the ALCS against the Boston Red Sox, he pitched well in two relief outings despite recording the loss in Game 5. Washington Nationals On January 18, 2005, Loaiza signed a one-year, $2.9 million deal with the Washington Nationals as a free agent. He went 12–10 with a 3.77 ERA in 34 starts for the Nationals. Oakland Athletics On November 28, 2005, Loaiza signed a three-year, $21.4 million contract with the Oakland Athletics. He had a disastrous start to his Oakland career, which led many fans to question his acquisition. Loaiza went 0–3 in April with an 8.35 ERA and opponents batted .385 against him. His early season troubles reached a nadir on April 29 when he gave up six runs in one plus innings to the Kansas City Royals, who had the worst record in baseball at the time; the game was not official since it was later rained out. Loaiza's poor performance was at least partly due to injury, as he seemed to have very little velocity on his fastball early in the season (throwing it at as little as 82–83 mph) and was placed on the disabled list with back and shoulder problems on May 2. When he returned on June 8, he was inconsistent, but appeared to be much healthier, due to his ability to demonstrate a much harder 95 mph fastball. On June 25, 2006, Loaiza pitched his first complete game in over two years in a 10–4 victory over the San Francisco Giants. Loaiza finished the 2006 regular season with a 4.89 ERA and a record of 11–9 in 26 starts. Loaiza began the 2007 season on the disabled list