Two-time Australian Open champion Victoria Azarenka is out of Wimbledon, beaten 6-3, 3-6, 7-5 by Bojana Jovanovski in a second-round match.
the number-eight seed Azarenka had more winners - 46 to 27 - than Jovanovski and also more total points, 104-101, but wasn't able to take advantage of her break-point opportunities.
A two-time semifinalist at Wimbledon, Azarenka converted only three of 16 chances, while the Serbian player was good on four of seven opportunities.
Azarenka had been recovering from a left foot injury and had a three-month layoff ahead of the grass-court season.
Meanwhile, Australian Open champion Li Na advanced to the third round at Wimbledon with a 6-2, 6-2 win over Yvonne Meusburger of Austria.
The second-seeded Li had two early service breaks and was also broken once on her service early in the second set, but took control at 4-2 and then broke the Austrian player a third time in the set.
Serving for the match, Li clinched the win with consecutive forehands to the open court and then a cross-court backhand volley.
In another match, five-time champion Venus Williams overcame a slow start to beat Kurumi Nara 7-6, 6-1 to reach the third round of a major for only the second time in her last 10 Grand Slam tournaments.
The 30th-seeded American won six straight points in the tiebreaker and ran off six straight games in the second set to beat Nara on Court 3 at the All England Club.
Other results (selected):
Petra Kvitova beat Mona Barthel 6-2, 6-0
Ekaterina Makarova beat Misaki Doi 7-5, 6-4
Agnieszka Radwanska beat Casey Dellacqua 6-4, 6-0