` It 's tough to lose 7-6 in the third -- it could have gone either way , but it did n't go my way today , '' Wozniacki told the official WTA website . ` Caroline Wozniacki beaten in first round of Brisbane International . The world number one was forced to retire after losing the opening set and then a tie-break against her compatriot Samantha Stosur. Australian Sam Stosur also exits to Swede Sofia Arvidsson . Serena Williams already into second round .
Caroline Wozniacki beaten in first round of Brisbane International . The world number one was forced to retire after losing the opening set and then a tie-break against her compatriot Samantha Stosur. Australian Sam Stosur also exits to Swede Sofia Arvidsson . Serena Williams already into second round .