McHale struggles to advance over Doi at Carlsbad

CARLSBAD, Calif. (AP) - U.S. Olympian Christina McHale held off Misaki Doi of Japan 4-6, 6-4, 6-4 at the Mercury Insurance Open on Thursday, advancing to a quarterfinal against No. 1 seed Marion Bartoli of France.

McHale, the No. 5 seed, needed three match points in the last game before she closed out the second-round match when Doi hit a backhand into the net.

McHale faced 19 break points, but Doi only converted three.

In another second-round match, Ursula Radwanska of Poland cruised to a 6-2, 6-1 win over lucky loser Melanie Oudin.

Radwanska, the younger sister of world No. 2 ranked Agnieszka Radwanska, served well and took advantage of the American's subpar serve to control the match.

"Yeah, I was playing very good, and especially I was serving good,'' said Radwanska, who will represent Poland in the Olympics. "Probably that was the key because I was holding my serve.''

Radwanska, who won 88 percent (23 of 26) of her first serves, reached the quarterfinals for the second straight week. She lost last week at Stanford to eventual runner-up CoCo Vandeweghe.