New Haven, Connecticut: Four-time champion Caroline Wozniacki advanced to the second round of the New Haven Open when China's Peng Shuai was forced to retire while up a set on Monday night.
Peng was leading 6-2, 1-3 when officials announced she could not continue due to dizziness. Peng never called for a trainer, but spent an extended time at her seat after fourth-seeded Wozniacki asked for a coach while leading 3-0 in the second set.
Wozniacki improved to 21-1 in New Haven. Her only loss here came in last year's semifinals when she had to retire due to a knee injury.
The start of the match was delayed two hours by rain.