Williams followed up her first round defeat of Taylor Townsend with her first meeting with another American in the form of World No.81 King. She had to like her chances, considering her only loss to a player outside the Top 10 at the US Open came against WTA legend Kim Clijsters.
Though King went into this clash 0-3 against World No.1s, she did have two wins over Top 10 players, including one over World No.7 Sara Errani earlier this year in Shenzhen.
The Turning Point
Williams broke King immediately, and though King held her next service game, that was the only game she would win all day.
By The Numbers
Williams lost just three points on her first serve, and in fact she has not lost her serve all tournament. Also, she was nine of 11 at the net and had 19 more winners than King.
All that added up to Williams' 74th US Open win, breaking a tie with Steffi Graf for third-most of the Open Era. She also improved to 14-1 since Wimbledon and continued her streak of never having lost before the third round at Flushing Meadows.
"I've been working really hard," Williams said. "The results just hadn't been coming in the Slams. I started to have some really good results this summer, and that's given me a lot of confidence going into this last Grand Slam of the year."
Williams squares off with an American for the third straight match, this time Varvara Lepchenko, who was a 6-4, 6-0 winner over Mona Barthel. Williams lost just three games in each of her two previous encounters with Lepchenko.