The first upset of the tournament: Sam Stosur was defeated in 91 minutes. Stosur lost in her home country's tournament in the opening round to Sorana Cirstea of Romania.

The 2011 U.S. Open champion lost her first set of the new year's first Grand Slam in a tiebreaker. She won only three games in the second set for a 7-6 (2), 6-3 loss. Stosur won just 55 percent of her first serves while Cirstea capitalized on 66 percent of her first serves.

The first set took 49 minutes to complete, just seven minutes longer than the second set, which shows that Stosur didn't just quit.

The loss, however, does add to Stosur's less-than-impeccable record in the year's first Grand Slam. The 27-year-old has won only 14 times in 10 trips to the Aussie Open. She has only gone beyond the third round twice. Last year, she was ousted by Petra Kvitova, who at the time was not a well known player, in the third round. Now, Kvitova is the tournament's No. 2 seed.

Stosur was the tournament's No. 6 seed.