Serena Williams insisted she 'didn't feel any pain' in her injured ankle as she powered into the third round of the Australian Open on Thursday.
The third seed was a comprehensive 6-2 6-0 winner over Spanish teenager Garbine Muguruza, dispelling any doubts over her fitness after rolling her right ankle during her first-round whitewash of Romanian Edina Gallovits-Hall.
Instead, Williams is more concerned about the appearance of her lip after hitting herself in the face with her racquet in the sixth game.
"I just busted it, busted it wide open," she laughed.
"I can't have a tooth fall out. That would be horrible."
Williams, a five-time champion at Melbourne Park, was pushed early by the 19-year-old Muguruza before eventually claiming victory in 75 minutes.
Muguruza, ranked 112 in the world, had her chances, but when Williams broke to claim a marathon 18-minute game to open the second set, there was never going to be any doubt about the result.
Aside from her swollen lip, Williams said she emerged unscathed from the performance and was set to play doubles later in the day with sister Venus.
"I felt pretty (good), much better than I ever dreamed of expecting to feel," she said.
"I woke up this morning and I was really shocked that I didn't have as much (discomfort)."
The American also sent down a 207 kilometres per hour thunderbolt on match point that shocked even herself.
"I did not expect that. I was like, 'Okay, I'm going to hit a big one, 200'. It went 207. I was like, Wow," she said with a smile.
Williams praised Muguruza after the match and predicted a bright future for the Spaniard.
"I thought she played really well. I actually thought she improved as the match went on. She was blasting balls for winners and she has a pretty big serve," she said.
"I didn't know anything about her game, so it was one of those players I had to see in warm-up and see in the first two games how she would play."
"But I thought she played really well, and she's only 19. I think she can do really well."
Williams remains on course for a third consecutive major title after winning Wimbledon and the US Open last year.