Sharapova withdraws; Kvitova loses in Brisbane AP 1/1/2013 8:07:32 AM (AP) Sharapova withdraws; Kvitova loses in BrisbaneBRISBANE, AustraliaMaria Sharapova withdrew from the Brisbane International with an injured right collarbone Tuesday, shortly before fellow Russian Anastasia Pavlyuchenkova beat 2011 champion Petra Kvitova 6-4, 7-5.Combined with Daniela Hantuchova's 4-6, 6-1, 7-5 win over No. 5 Sara Errani and the first-round exits of No. 7 Sam Stosur and No. 8 Caroline Wozniacki, the season-opening event featuring eight of the top 10 ranked women had already lost five of its top eight seeds before the end of the second round.No. 2-ranked Sharapova said she didn't want to risk aggravating a collarbone problem that flared late last month and had also forced her out of an exhibition in South Korea. She was heading to Melbourne to prepare for the Australian Open, starting Jan. 14.