Roddick retires with knee pain at Shanghai Masters

SHANGHAI (AP) -Andy Roddick was forced to retire with left knee pain while leading Stanislas Wawrinka 4-3 in the second round of the Shanghai Masters.

Roddick, who limped into the post-match news conference on Tuesday, quit after wasting a break point.

Roddick is vying for one of the final three spots at the season-ending ATP World Tour Finals in London next month. But the sixth-ranked Roddick says he's more concerned about taking care of his health than qualifying for the eight-man event.

The 22nd-ranked Wawrinka will play 13th-seeded Radek Stepanek of the Czech Republic in the third round.

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