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Roddick won eight titles in the 2003 season, the most successful season of his career. He captured his first Masters Series title at the Miami Masters, and also won the Houston clay-court event. He reached the final of the US Open, where he was defeated by Juan Carlos Ferrero. Roddick's powerful serve and improved all-court game helped him achieve his career-high ranking of No. 1 in November 2003.