Serena wins to set up semifinal showdown vs. Sharapova

Key Biscayne, FL ( - World No. 1 Serena Williams beat fifth- seeded German Angelique Kerber 6-2, 6-2 Tuesday night in the quarterfinals of the lucrative Sony Open.

Williams won 75 percent of the points on her serve, fired seven aces and broke Kerber twice in each set.

The American's victory sets up a marquee semifinal showdown against Maria Sharapova. The two met in last year's final at this event, with Williams battling back from a set down to capture her sixth Miami title.

Sharapova, a five-time runner-up in Miami, took out eighth-seeded Czech slugger Petra Kvitova 7-5, 6-1 earlier Tuesday on the hardcourts at Crandon Park.

The fourth-seeded Russian was down a break in the first set before turning things around.

The quarterfinals will wrap up on Wednesday when second-seeded Australian Open titlist Li Na faces 11th-seeded former No. 1 Caroline Wozniacki and third-seeded Agnieszka Radwanska takes on 10th-seeded Aussie Open runner-up Dominika Cibulkova. Radwanska titled in Miami two years ago and was the runner-up at Indian Wells two weeks ago.

The 2014 Miami champion will collect $787,000.