Canadian Milos Raonic fired down 13 aces to defeat Miomir Kecmanovic 6-3, 6-4 and set up a BNP Paribas Open semifinal against Dominic Thiem after the Austrian's opponent, Gael Monfils, withdrew injured before their match on Thursday.
"I tried to hit a little bit and I can not compete 100 per cent so I'm so sorry guys to put myself in this situation", Monfils said.
Bencic won her third career title at Dubai last month and her first since 2015.
"I think that can get better", Raonic said. Until Kerber stopped her, Williams had won four matches in a row for the first time since a year ago in the desert.More news: Osaka shrugs off Indian Wells upset
Kerber, a three-time Grand Slam victor, won her first set thanks to a dramatic tie-break that featured four breaks of serve.
The teenager certainly made the most of it. Kecmanovic got by three players in straight sets to set up his second meeting with Raonic, but that is where his luck ended.
"I would like to thank you for everything you gave me this week and again I'm sorry".
Raonic is 2-0 in his career against Thiem, winning both matches in straight sets on hard-courts in 2016.More news: Who are these masked footballers? Pierre-Emerick Aubameyang, Raul Jimenez, Jonas Gutierrez
"I was really surprised", Thiem said, who was waiting to be taken to the court when he realized there was a problem".
Andreescu will play the victor of the second semifinal between No. 23 seed Belinda Bencic of Switzerland and No. 8 seed Angelique Kerber of Germany in Sunday's final.
Belinda Bencic beat fifth-seeded Karolina Pliskova 6-3, 4-6, 6-3 to reach the semis, ensuring her return to the top 20 in the rankings. She broke Williams in the match's longest game that went to deuce five times when Williams' forehand went wide. "I have this pain, and it wasn't the right choice to play".
He has accepted a wild card into the qualifying draw in Miami, which will mark the first time he's played a qualifying tournament since 2007 at Queen's Club. "It's always tough to play against her". She was coming off a straight-set upset of defending champion and top-ranked Naomi Osaka in the fourth round.More news: How do Champions League, Europa draws affect Premier League title, Top Four?
The 18-year-old from Mississauga, Ont., dug deep to upset No. 6 seed Elina Svitolina of Ukraine 6-3, 2-6, 6-4 in a thrilling semifinal on Friday night.