New Haven: Caroline Wozniacki found another way to win at the New Haven Open, where she has lost just one match in six years.
The four-time champion advanced to the second round Monday when Peng Shuai was forced to retire while up a set.
Peng was leading 6-2, 1-3 when the chair umpire announced the Chinese player could not continue due to illness. Tournament officials later said she was suffering from dizziness. Peng, who has a history of heart problems, spent an extended time with a trainer after Wozniacki asked for a coach while leading 3-0 in the second set.