Kim Clijsters pulls out of Cincinnati Open with an abdominal injury . `` I trained very hard this summer and felt in a good shape to play the U.S . three -time defending champion Clijsters has missed final Two grand slams of 2011 . Clijsters sustained the injury in the Rogers Cup in Toronto last week . Kim Clijsters marches into semifinals in Toronto to play Vera Zvonareva .
Kim Clijsters pulls out of Cincinnati Open with an abdominal injury . three -time defending champion Clijsters has missed final Two grand slams of 2011 . Clijsters sustained the injury in the Rogers Cup in Toronto last week . Kim Clijsters marches into semifinals in Toronto to play Vera Zvonareva .