Dallas defeat for Keothavong
Anne Keothavong bowed out to New Zealand's Marina Erakovic in the first round of the Texas Open after losing a final-set tie-break.
The British number two, 80th in the world rankings, looked poised to earn a fine win over the 54th-ranked Erakovic in Dallas after leading by a break of serve in the deciding set.
But she gave the break back and Croatia-born Erakovic, who at 24 is four years Keothavong's junior, edged through 6-1 5-7 7-6 (11/9).
Erakovic later teamed up with British number one Heather Watson in doubles and the pair got the better of Elizabeth Lumpkin and Yasmin Schnack, overcoming the little-known American pair 6-2 2-6 10-8.
Meanwhile, Britain's Emily Webley-Smith was handed a late call for the tournament, entering as a lucky loser when German top seed Angelique Kerber withdrew due to a minor shoulder injury. Webley-Smith did not last long though, beaten 6-1 6-2 by Croatian qualifier Mirjana Lucic.
Elsewhere, Serbian second seed Jelena Jankovic narrowly avoided a first-round exit as she edged past Kazakhstan's Yaroslava Shvedova in three sets.
Jankovic dropped the opener on a tie-break and the second also went all the way after three breaks of serve from each player. But once Jankovic levelled the match the momentum turned her way and she posted a 6-7 (9/7) 7-6 (7/4) 6-1 victory to get her campaign under way at the Dallas tournament.
Roberta Vinci, the Italian third seed, took a more comfortable route to the second round, breezing through 6-2 6-2 at the expense of Taiwanese opponent Hsieh Su-Wei.
China's Peng Shuai turned her match around against Japan's Ayumi Morita, the sixth seed lifting her performance a level after dropping the opening set to prevail 4-6 6-0 6-3.
There were also victories for four qualifiers as France's Pauline Parmentier, Australian Casey Dellacqua and Canadian Eugenie Bouchard enjoyed straight-sets successes.