BRISBANE, Australia — Maria Sharapova withdrew from the Brisbane International on Tuesday because of an injured right collarbone that left her unable to serve. She said she didn’t want to aggravate the injury with the Australian Open two weeks away.
Also out was 2011 champion Petra Kvitova, who lost 6-4, 7-5 to Russia’s Anastasia Pavlyuchenkova in a season-opening tournament that has proved rough for many of the top players.
Serena Williams, however, had no such problems. She carried her relentless winning form into 2013, reaching the quarterfinals with a 6-2, 6-2 victory at night over No. 44-ranked Alize Cornet.
Williams, a 15-time major winner who is ranked No. 3, has lost only one of her last 34 competitive singles matches in a run that includes titles at Wimbledon, the London Olympics and the U.S. Open.
She was hitting winners so fiercely that Cornet didn’t bother chasing most of them. One of her serves, in the fourth game of the second, was 124 mph (200 kilometers). That was fa...