Mason, Ohio: Juan Martin del Potro advanced in straight sets to the semifinals of the Western & Southern Open, which was still catching up from the rain.
Del Potro beat France's Jeremy Chardy 6-1, 6-3 in the opening match Friday morning, reaching the tournament's semifinals for the first time. His biggest concern has been a sore left wrist that he'll have examined before the U.S. Open.
The Argentine won the Open in 2009. The right-hander missed most of the 2010 season while recovering from surgery on his right wrist. The doctor who performed that surgery will look at the other one following the tournament in suburban Cincinnati.