2009 US Open – Men's singles final
| Roger Federer (1) vs. Juan Martín del Potro (6) | |||||||||||||||||||
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| Date | September 14, 2009 | ||||||||||||||||||
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| Tournament | US Open | ||||||||||||||||||
| Location | New York City, U.S. | ||||||||||||||||||
| Chair umpire | Jake Garner | ||||||||||||||||||
| Duration | 4 hours 6 minutes | ||||||||||||||||||
The 2009 US Open Men's Singles final was the championship tennis match of the Men's Singles tournament at the 2009 US Open. In the final, Juan Martín del Potro defeated 5-time defending champion Roger Federer 3–6, 7–6(7–5), 4–6, 7–6(7–4), 6–2 after 4 hours and 6 minutes to win the match. It was the first US Open singles final that went to 5 sets since 1999, a span of 10 events. The 2009 US Open final was Del Potro's first win over Federer, having lost his 6 previous encounters against the Swiss.
By winning the 2009 US Open, Del Potro became the first Argentinian man since Gastón Gaudio in 2004 to win a Grand Slam singles title, the first Argentinian man since Guillermo Vilas in 1977 to win a US Open singles title and the first Argentinian man to win a hard court Grand Slam singles title (Vilas won his US Open title on green clay).