Williams serving to reach the final round.

Three aces out wide put Williams ahead 40-0.

The players traded forehand winners as well as errors before a final Williams ace down the tee, her 16th ace for the day, on match point number five would end the match.

The American would finish the match with 33 winners to only five unforced errors.

And with her WTA Tour titles this spring and summer in Charleston, Madrid, Wimbledon and Stanford, Williams has won 33 of her last 34 matches.

Head to head versus Sharapova, Williams leads 8-2 with the American taking the duo’s last match in the Madrid quarterfinals this spring 6-1, 6-3.

However on grass, the pair are even head to head 1-1 with both meetings at Wimbledon in 2004 and 2010.

Williams won the pair’s 2010 Wimbledon fourth round match 7-6(11-9), 6-4 with a major key being the American’s ability to win free points from her serve.

Following the singles play, Serena Williams and her sister Venus Williams are also scheduled Saturday to compete in the women’s doubles semifinals versus Kirilenko and Nadia Petrova of Russia.