<p>Del Potro earned a shot at winning his second title of the year by wearing down Chile's Fernando Gonzalez in oppressive afternoon heat 7-6, 6-3 in the other semifinal. <br /><br />"It will be tough," Roddick said of Sunday's final against Del Potro. "You know what you're going to get from him. He plays at a high level every day. That's why he's sixth in the world." <br /><br />Roddick, bidding for his fourth Washington title, managed only nine aces but never lost his serve during the two-and-a-half hour match against the 80th-ranked Isner.<br /><br />Pennetta stuns Sharapova <br />In Los Angeles, Italy's Flavia Pennetta stunned former world number one Maria Sharapova 6-2, 4-6, 6-3 in the semifinals of the LA Championships on Saturday. <br /><br />Pennetta, the 10th seed, will meet Samantha Stosur in the final after the Australian used her big serve to overwhelm Romanian teenager Sorana Cirstea 6-3, 6-2. <br /><br />Playing her eighth match in 12 days, three-times grand slam champion Sharapova clearly lacked energy as the match wore on and squandered a 3-1 lead in the third set thanks to a litany of double faults and sloppy errors. <br /><br />"I didn't feel fresh," said Sharapova, who double faulted 16 times and had 61 unforced errors compared to 23 from Pennetta.</p>
<p>Del Potro earned a shot at winning his second title of the year by wearing down Chile's Fernando Gonzalez in oppressive afternoon heat 7-6, 6-3 in the other semifinal. <br /><br />"It will be tough," Roddick said of Sunday's final against Del Potro. "You know what you're going to get from him. He plays at a high level every day. That's why he's sixth in the world." <br /><br />Roddick, bidding for his fourth Washington title, managed only nine aces but never lost his serve during the two-and-a-half hour match against the 80th-ranked Isner.<br /><br />Pennetta stuns Sharapova <br />In Los Angeles, Italy's Flavia Pennetta stunned former world number one Maria Sharapova 6-2, 4-6, 6-3 in the semifinals of the LA Championships on Saturday. <br /><br />Pennetta, the 10th seed, will meet Samantha Stosur in the final after the Australian used her big serve to overwhelm Romanian teenager Sorana Cirstea 6-3, 6-2. <br /><br />Playing her eighth match in 12 days, three-times grand slam champion Sharapova clearly lacked energy as the match wore on and squandered a 3-1 lead in the third set thanks to a litany of double faults and sloppy errors. <br /><br />"I didn't feel fresh," said Sharapova, who double faulted 16 times and had 61 unforced errors compared to 23 from Pennetta.</p>
