Serena Williams was so dominant in her 6-1, 6-1 third-round win over Greta Arn at the Australian Open that there's probably only one shot she'll remember more than most.
At 5-0 and a point from winning the first set, Williams lined up in the ideal position for overhead but then completely shanked it, spraying the ball wide. She screamed and put a hand over her face.
The 92nd-ranked Arn saved another set point before holding serve for the first time. Williams responded by winning the next five games before Arn held again. The match ended in 59 minutes Saturday, on consecutive double-faults by the Hungarian.
"I'm nowhere near where I want to be," said Williams, who has won her last 17 matches at Melbourne Park. "I'm just trying to play through it. A little rusty - just trying to play through my rust."
Williams has won the Australian Open five times, including back-to-back titles in 2009 and 2010. She didn't get to defend her title last year due to injury.
She badly sprained her left ankle in a warmup tournament at Brisbane two weeks ago, casting doubt again on her participation at Melbourne, but the 13-time major winner has shown no signs of being restricted in her first three matches - she has only conceded 11 games.
Next up she faces Ekaterina Makarova, who beat fellow Russian and seventh-seeded Vera Zvonareva earlier Saturday.
Williams is the only American left in the singles at the Australian Open after Vania King lost earlier to former French Open winner Ana Ivanovic - the last U.S. man exited the tournament Friday when John Isner lost in five sets to Spaniard Feliciano Lopez.