Wozniacki out of Brussels Open
Caroline Wozniacki crashed out of the Brussels Open after a straight-sets defeat to China's Zheng Jie.
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The number one seed was beaten 6-2 6-4 just hours after Zheng had beaten American qualifier Mallory Burdette 6-2 4-6 6-3.
Rain had washed out Tuesday's play in Belgium meaning a packed schedule, but it had little effect on the world number 51.
"She's a very tough player and fought until the last point," Zheng said.
"I'm so happy I could win this match. We've played many times before and she's always so tough to beat. But she's also a very nice person, ever since she was a junior. I'm very proud and this gives me a lot of confidence."
Zheng missed out on her first two match points and watched 6-2 5-1 close to 5-4 in the second before a huge forehand closed out the match.
Number three seed Dominika Cibulkova was another who suffered a shock exit falling to Kaia Kanepi 6-4 7-6 (7/6), who then went on to beat Jana Cepelova in her second round match, 6-3 6-3.
"It was really tough to wake up so early and then play at 10 in the morning," Kanepi said.
"It's tough to play two matches in one day, but I handled it well and I'm happy to have won both matches.
"I felt a little tired in the second match but I really focused and tried not to think about it."
Former British number one Elena Baltacha saw her return to the WTA circuit end with a bump as she was thrashed by seventh seed Varvara Lepchenko.
The American won 6-2 6-0 to set up a meeting with Kanepi.
Baltacha had gained an impressive first-round win over Stefanie Voegele on Monday in what was her first tour-level match since July. She underwent foot surgery last autumn.
Elsewhere, number four seed Sloane Stephens and eighth seed Peng Shuai both progressed but Julia Goerges, seeded six, fell, retiring in her second-round match against Romina Oprandi due to a wrist injury.