Serena Williams beaten in first round of Brisbane International . Ksenia Pervak of Brisbane wins three -6 6-3 7-6 in marathon match . Australian Sam Stosur also exits to Swede Sofia Arvidsson . The pair had gone to three sets in their previous two meetings , both won by Wozniacki , but this time the tables were turned . Sofia Arvidsson already into first round .
Serena Williams beaten in first round of Brisbane International . Ksenia Pervak of Brisbane wins three -6 6-3 7-6 in marathon match . Australian Sam Stosur also exits to Swede Sofia Arvidsson . Sofia Arvidsson already into first round .