Australian Open semi-finalist Madison Keys was bundled out of the Abierto Akron Zapopan in Guadalajara on Monday after a shock three-set loss to Harmony Tan.
Frenchwoman Tan, who is ranked outside the top 100, toppled the second seed in one hour and 46 minutes, winning 6-4 1-6 6-1.
In a seesawing battle, Tan's shotmaking and deft touch was a highlight, helping her steady after emphatically dropping the second set, before winning the first five games of the final set.
The win was Tan's first-ever victory against a top 30 player, qualifying her for the second round where she will play China's Wang Qiang who won 6-2 6-1 over Lauren Davis.
American sixth seed Sloane Stephens did not have such problems in her first-round encounter with qualifier Brenda Fruhvirtova, triumphing 6-2 6-2.
The 14-year-old Czech had enjoyed a good qualifying run but was thwarted by the 2017 US Open champion in 58 minutes.
Fruhvirtova had become the youngest player to compete in a WTA Tour main draw match since Keys in April 2009 at Ponte Vedra Beach.
Fifth seed Nuria Parrizas Diaz bowed out 6-1 6-4 to Slovakia's Ana Karolina Schmiedlova in one hour and 10 minutes. Schmiedlova will face Anastasia Potapova who progressed 6-4 2-2 after Lesia Tsurenko retired.
Japanese seventh seed Misaki Doi also exited, going down 4-6 7-5 6-4 to Marie Bouzkova in the late match, setting up a second-round date with qualifier Lucia Bronzetti who edged American wildcard Caty McNally 6-7 (5-7) 6-3 6-3.
Zheng Qinwen was another seeded casualty, with the Chinese eighth seed going down 6-3 2-6 6-2 to Anna Kalinskaya.
Raducanu stunned by qualifier Carle in Madrid
Maria Lourdes Carle made a splash at the Madrid Open on Wednesday, as the qualifier sent Emma Raducanu packing.
World number 82 Carle stepped into the void to fill in for Karolina Pliskova, who withdrew prior to the end of the qualifying rounds, to face 2021 US Open champion Raducanu.
It is just the second time Carle has reached the main draw of a WTA 1000 event, and she ensured it would be a memorable campaign after a 6-2 6-2 victory over Raducanu, who is now ranked at world number 221, though has enjoyed something of a return to form this season.
Raducanu reached the quarter-finals of the Stuttgart Grand Prix last week, going down to world number one Iga Swiatek, but has recently enjoyed victories over the likes of Angelique Kerber and Caroline Garcia.
Data Debrief
Carle is the first player from Argentina to defeat a former women's singles grand slam Champion since Nadia Podoroska overcame Serena Williams in Rome in 2021.
The 24-year-old is making just her sixth WTA main draw appearance, with her first WTA 1000 appearance having come in Miami in March.
Osaka storms to victory in Madrid opener to end long wait for win on clay
Naomi Osaka comprehensively dispatched Greet Minnen on Tuesday to make a winning start to her Madrid Open campaign and earn a first win on clay for two years.
Japanese star Osaka triumphed 6-4 6-1 in only 79 minutes, swiftly booking a second-round clash against Liudmila Samsonova.
Osaka reached the last 32 at the WTA 1000 events on the hard courts of Indian Wells and Miami but had lost to Martina Trevisan at the first hurdle in the Open de Rouen on clay at WTA 250 level last week.
This was therefore a welcome return to form against Belgian qualifier Minnen and represented her first triumph on the surface since beating Anastasia Potapova at this tournament in 2022.
After an even start to the contest, the first set was level at 4-4. But Osaka then assumed full control, winning eight of nine games to race to victory.
Data Debrief: Osaka dominates on serve
Osaka was not broken at all in the match and allowed Minnen only one break-point opportunity across the whole contest.
She fired down eight aces to only three double faults, and won 13 of her 16 first-serve points in the second set.
Danielle Collins wins Charleston Open to seal back-to-back titles
Danielle Collins secured back-to-back tournament wins with a 6-2 6-1 victory over Daria Kasatkina in the Charleston Open final.
After winning the Miami Open last week, Collins earned her 13th successive victory in style as she dropped just three games in her latest triumph.
The American, who moved up to 15th in the world rankings, needed just 77 minutes to dismiss her opponent without facing a break point in the whole of the contest.
https://x.com/WTA/status/1777063713234702821
Collins said: “I had a lot of matches in Miami and I had a lot of matches here.
“I had, at one point in this tournament, two matches in one day, which is not easy to pull off. I don’t know if I’ve done that before as a professional. I feel like the last time I did that was like in 12-and-unders.
“So to be able to physically battle and push myself to a new limit gives me a lot of confidence. I’ve been so happy to be, obviously, playing at the level that I’ve been playing, but to be able to back it up two weeks in a row has just been fantastic.”
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