In the 2003 postseason, Ortiz struggled in the ALDS against the Oakland A's until Game 4, when he hit a two-run double in the bottom of the eighth inning off closer Keith Foulke to turn a 4–3 deficit into a 5–4 Red Sox lead and eventual victory. In Game 1 of the AL Championship Series against the rival New York Yankees, Ortiz hit his first career postseason home run. He finished with two home runs and 6 RBI in the ALCS, including a solo home run in the eighth inning of the decisive Game 7 that gave the Red Sox a 5–2 lead at the time. However, the Red Sox would go on to blow the lead in the bottom of the inning, and Boston lost the series in heartbreaking fashion on Aaron Boone's infamous extra-inning walk-off home run that instead sent the Yankees to the 2003 World Series.