World No 1 Iga Swiatek continued her Indian Wells title defense with a 6-3 6-1 victory over Emma Raducanu on Tuesday to set up a quarter-final against unseeded Romanian Sorana Cirstea.
Swiatek came under pressure early in the opening set but some clean ballstriking helped her hold for a 3-2 lead after two tight service games. She raised her level further to break Raducanu in the next game before pulling away.
Having wrapped up the first set when Raducanu sent a shot long from the baseline, Swiatek grabbed an early break in the second to heap the pressure on the Briton, whose unforced errors began to mount.
Swiatek, bidding to become only the second female player to successfully defend the Indian Wells title after Martina Navratilova in 1990-91, raced to a 5-1 lead playing flawless tennis and running her opponent ragged.
The US Open champion, who arrived in California following a title in Doha and a run to the Dubai final, closed out the win when Raducanu struck the net on serve in a tame end to her fine run at the tournament.
"I just feel like in these longer rallies I was the one who showed I can bring the pressure on defense and it's not easy to finish the rally," Swiatek said. "She was actually doing the same. She was running to every ball and she played those slices which are tricky, but honestly I'm pretty happy with how positive I was and disciplined."
Earlier in the day, Coco Gauff rallied from a break down in the final set to beat Swede Rebecca Peterson 6-3, 1-6, 6-4 and reach the quarters for the first time.
After taking the first set, the sixth-seeded American began to struggle with her forehand in the second and an opportunistic Peterson applied the pressure by coming into the net.
But after suffering an early break in the decider, Gauff stepped up her defense, fending off three break points at 4-4 and breaking Peterson for a fourth time on match point to book her spot in the last eight.
Gauff, who turned 19 on Monday, was later serenaded with a rendition of 'Happy Birthday' by the crowd.
"Today, it was just a mental thing, staying in the match," Gauff said. "I wasn't playing my best in some moments and wasn't serving as well as I'd like to, but I think my mentality kept me in today."
Next up for Gauff is a meeting with Belarusian second seed Aryna Sabalenka, who survived a second-set scare to beat 16th seed Barbora Krejcikova 6-3, 2-6, 6-4.
Sabalenka sent down 11 aces in the match to secure victory and get revenge on the Czech, who beat her in the Dubai Duty Free Tennis Championships quarter-finals last month.
Elsewhere, seventh seed Maria Sakkari outlasted big-serving Karolina Pliskova 6-4, 5-7, 6-3 in a two-hour and 45-minute match to reach the quarters and gaining her own revenge after a heavy defeat to the Czech in Dubai.
With the win the Greek keeps alive her hopes of capturing a first Indian Wells crown after making the final last year.
Sakkari will next face Czech 15th seed Petra Kvitova for a semi-final spot, after the two-time Wimbledon champion saved four match points en route to a 6-2, 3-6, 7-6 win over third-seeded American Jessica Pegula.
"I play for these emotions," Kvitova said. "The match was up and down, a disaster at times. I knew Jessica will not miss, but I still had to go for it. I think this might be one of the best matches I played."
Cirstea bagged her first top-five win since 2017 in Beijing as the 32-year-old battled past fifth seed Caroline Garcia 6-4 4-6 7-5.
Wimbledon champion Elena Rybakina beat Varvara Gracheva 6-3 6-0 and will next take on Karolina Muchova, who overcame Marketa Vondrousova 6-4, 6-7, 6-4.
