In preparation for the 2012 Olympic Games in London, we're profiling 20 of the top medal contenders.

Juan Martin del Potro has never contested a grass-court final and has yet to surpass the fourth round in five Wimbledon appearances, but if his creaky left knee is healthy, the man with the mammoth forehand can contend for Argentina’s first Olympic medal in men’s singles.

While del Potro concedes that grass is his most challenging surface, the best-of-three set Olympic format should make the 6’6” baseliner even more dangerous, as shorter matches maximize his explosiveness and minimize the beating on his big body.

Though he is just 4-9 against Top 10 opponents this season, with five of those losses coming to Roger Federer, del Potro is a threat to anyone at his best, as he showed winning the 2009 U.S. Open.

“I still prefer the hard court,” del Potro said. “I'm playing better day to day, training hard on grass court for the Olympics also.”

Previous Olympic Singles Results

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Previous Olympic Doubles Results

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More Olympic Profiles:

—Agnieszka Radwanska
—Ana Ivanovic
—Andy Murray
—Andy Roddick
—Angelique Kerber
—Jo-Wilfried Tsonga
—John Isner
—Juan Martin del Potro
—Kei Nishikori
—Kim Clijsters
—Li Na
—Maria Sharapova
—Milos Raonic
—Novak Djokovic
—Petra Kvitova
—Roger Federer
—Serena Williams
—Tomas Berdych
—Venus Williams
—Victoria Azarenka