Argentina's Diego Hartfield surprised second-seeded German Tommy Haas 6-2, 3-6, 6-2 on Monday in the opening round of the ATP Delray Beach International Tennis Championships.
Hartfield, playing here for the first time, converted five of his 17 break point opportunities to hand Haas a defeat in the German's first outing of the year.
He needed just one hour and 55 minutes to send the 2006 Delray Beach champion packing.
"I'm very happy," said Hartfield, who claimed the first hardcourt match of his career in five attempts. "I always knew I could play good on hard courts. I was practicing in Buenos Aires on hard courts before Australia and I was playing good."
Haas, who had shoulder surgery in November, has seen his ranking fall from a year-end No. 12 to No. 27 after missing the first six weeks of the year.
He spent 22 weeks inside the top 10 last year as he won the title in Memphis and reached the Australian Open semi-finals and US Open quarter-finals.
"Overall [the shoulder] feels good," Haas said. "It's my first test. Unfortunately the shoulder went away a bit at the end of the second set. I didn't have the pop anymore. I didn't really have any pain, just no power."
Hartfield will play American Bobby Reynolds, who beat defending champion Xavier Malisse of Belgium 6-2, 4-6, 6-3.
AP, COSTA DO SAUIPE, BRAZIL
Three-time French Open champion Gustavo Kuerten began his professional tennis farewell tour with a first-round doubles loss at the Brasil Open.
Kuerten and countryman Andre Baran went down 6-3, 6-3 to Italy's Fabio Fognini and Filippo Volandri on Monday in this seaside resort in northeastern Brazil.
Kuerten announced last month he will retire from professional tennis after the next French Open, which starts on May 26 at Roland Garros.