Kim Clijsters' campaign at the Premier Mandatory event in Toronto has come to an end in the second round, as the Belgian retired from her match against China's Jie Zheng.
Zheng, who spoke to Clijsters after the match, stated in a post-match interview that it was a "stomach muscle" problem that prevented Clijsters from completing the match.
Clijsters, the No. 2 seed in Toronto, had won the first set 6-3 and with Serena Williams so close to Clijsters in the Toronto draw, many fans were looking forward to a Williams versus Clijsters showdown in Round 3.
It was not meant to be, however, as Clijsters did not want to risk further injury in the match.
Clijsters is the two-time defending champion at the US Open and, in fact, she has won the Grand Slam from New York the last three times she has challenged the event. She is also the reigning champion at the other hard-court Slam, as Clijsters defeated Na Li in the final of the Australian Open in January.
However, with her retirement from this match, you have to wonder how fit Clijsters will be for Flushing Meadows, a tournament that begins later this month.
Zheng, a two-time Grand Slam semifinalist, received a little bit of luck in the match, and she may need some more if she is to continue a run at WTA Toronto with Williams likely up next.