Venus Williams moved a step closer to her first Key Biscayne title since 2001 when she beat top-ranked Angelique Kerber, 7-5, 6-3, Wednesday night in the quarterfinals of the Miami Open.
It was Williams' 15th career win against a No. 1 player, but her first since 2014. Seeded No. 11, she's into the tournament's semifinals for the first time in seven years.
Williams' opponent Thursday night will be No. 10-seeded Johanna Konta, who became the first British woman to reach a semifinal in the tournament by beating No. 3 Simona Halep, 3-6, 7-6 (7), 6-2. No. 2 Karolina Pliskova will play No. 12 Caroline Wozniacki in the other semifinal.
Williams took charge of her quarterfinal match when Kerber double-faulted on the final two points of the opening set, and broke serve twice more early in the second set. She closed out the victory on her fifth match point with a backhand winner.
It was a matchup of offense against defense, with Williams the more aggressive player, charging the net often. Kerber stayed rooted to the baseline and was on the defensive even when she served, facing 13 break points and losing serve five times.
The German will remain No. 1 next week despite her loss. She reclaimed the top ranking this month after Indian Wells, replacing Serena Williams, who is sidelined by a knee injury.
Venus Williams improved to 61-13 at Key Biscayne, where she is making her 18th appearance. She won the title in 1998, 1999 and 2001 and considers the tournament her hometown event — she lives 90 minutes north in Palm Beach Gardens.
At 36, Williams was the oldest woman to enter the draw, but she hasn't been taxed physically while winning every set in her four matches.
On the men's side, Fabio Fognini became the first unseeded player in 10 years to reach the men's semifinals at Key Biscayne when he beat 2016 runner-up Kei Nishikori, 6-4, 6-2. Fognini, 29, who matched his best showing in an ATP Masters 1000 event, will next play the winner of Wednesday night's match between Rafael Nadal and Jack Sock.