Del Potro crashes out in Tokyo

Top seed and US Open champion Juan Martin Del Potro was dumped out of the Rakuten Japan Open in Tokyo on Tuesday as he lost his first-round match 6-4 6-4 against French qualifier Edouard Roger-Vasselin.

Playing for the first time since claiming his maiden grand slam title in New York, Del Potro was never at his best against world number 189 Roger-Vasselin, who had not previously won a match on tour since last July.

Del Potro, who reached the final in Tokyo last year, told the ATP website: "I didn't feel 100%. Everyone could see that. I had a little bit of jet-lag and a stomach ache but that's not the reason I lost."

Next up for Roger-Vasselin, whose father Christophe reached the French Open semi-finals in 1983, is a second-round clash with Jurgen Melzer of Austria, who beat Argentina's Leonardo Mayer 7-6 (7/4) 6-3.

Elsewhere, eighth seed Lleyton Hewitt was a 6-1 7-5 winner over Japanese wild card Tatsuma Ito.

"My real focus now is the Australian Open next year," said Hewitt. "I am training very hard to get as fit and mentally strong for next season."

Fifth seed Tomas Berdych beat local boy Go Soeda 6-2 6-4.