Thiem is through to the semifinals at Indian Wells for the first time, having reached the quarters once before in 2017.
Dominic Thiem advanced to the ATP Indian Wells Masters semi-finals after France's Monfils pulled out with a left Achilles tendon injury. This will of course cast doubts on his inclusion in the main draw of the Miami masters.
Bianca Andreescu's dream run will take the Canadian teen to the final of the BNP Paribas Open.
When asked where a title this week would rank in his career, Raonic said, "It would be there, I believe, parallel to the Wimbledon final (in 2016), if not higher, just because it's going through a week amongst the best players in the world without sort of ending with a loss".
Though she lost serve to begin the second set, Kerber rebounded immediately as the two traded breaks twice in the second set, before she won the last three games to seal the match and her spot in the final.
At 15-3 this year, Monfils was off to the best start of his career, but he was 0-4 against Thiem.
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From 4-2 down, the World No.8 ran off the last four games of a high-quality opener which saw almost 20 winners combined between the two players, and Kerber broke the No.23 seed for the third time from 30-0 down in the set's last game. He put only 55 percent of his first serves in play.
"I was really surprised", Thiem said, who was waiting to be taken to the court when he realized there was a problem".
Earlier in the day, Swiss underdog Bencic continued her scintillating form by coming through a thriller against her close friend Karolina Pliskova, winning 6-3 4-6 6-3. She broke Williams in the match's longest game that went to deuce five times when Williams' forehand went wide.
With the momentum in her favour, Kerber edged out the seven-time grand slam champion in a closely fought second set to advance to the final four.
"When you're confident, you can really just trust your instincts and you don't have to think about it at all", Bencic said. In the victory, Bencic won 78 percent of her first serve points and 45 percent of her second serve points. She'll face No. 6 seed Elina Svitolina of Ukraine on Friday.
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