11/14/2009 05:12 am ET Updated 4 days ago

Federer Falls To 20-Year-Old Argentine In U.S. Open Final (VIDEO)

Roger Federer hadn't lost a match at Flushing Meadows in six years. Until Monday evening, when 20-year-old Argentine Juan Martin Del Potro defeated the all-time major winner 3-6, 7-6 (5), 4-6, 7-6 (4), 6-2 in a five-set thriller. The championship is the first slam title for #6 ranked Del Potro and the first men's title at the U.S. Open for a South American since Argentina's Guillermo Vilas won in 1977.

From the AP:

Federer had won 40 consecutive matches at Flushing Meadows. He was seeking to become the first man since Bill Tilden in 1920-25 to win the American championship six straight times and the first man since Rod Laver in 1969 to win three straight majors in a season.

Del Potro upset No. 3 Rafael Nadal in the semifinals in straight sets.

WATCH Championship Point:

WATCH Federer lose his cool and curse at the chair umpire here.