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Canada’s Leylah Fernandez advanced to the quarterfinals of the Madrid Open with a straight-sets win over Ann Li on Monday.

Fernandez, seeded 24th, defeated the 31st-seeded American 6-3, 6-2 in the Round of 16 of the clay-court tournament.

Later, men’s third seed Félix Auger-Aliassime of Montreal was upset 7-6 (3), 6-3 by Belgium’s Alexander Blockx in the men’s third round.

Fernandez, from Laval, Que., converted three of eight break-point chances in a match that lasted one hour 23 minutes, firing six aces and winning 75.6 per cent of her first-serve points. Li failed to convert either of her two break opportunities.

The Canadian will face ninth-seeded Mirra Andreeva of Russia in the quarterfinals.

The match between Auger-Aliassime and Blockx featured just two break-point chances, with Auger-Aliassime missing a chance to go up 2-0 in the first set, and Blockx succeeding when getting the same opportunity in the second.

Auger-Aliassime, who came into Madrid with a career-high world ranking of No. 5, fell to 18-8 on the season.

Shrimp tacos caused illness?

Tennis players are facing an unknown opponent at the Madrid Open.

A stomach virus or food poisoning has affected Coco Gauff, Marin Cilic and a few others, causing some concern.

World No. 1 Aryna Sabalenka avoided an upset by Naomi Osaka on the court on Monday and said she’s trying to avoid illness by sticking to a simple diet of chicken breast, rice and salad.

The rumour among the players was bad shrimp tacos were to blame.

Sabalenka knocked on wood and while laughing said, “So far, so good. I heard that I have to avoid those tacos. I stick to the same food, same meal that I’ve been having since the very beginning of the tournament.”

Sabalenka said she was spending as little time as possible on site at the Caja Magica tennis complex.

“I try not to stay for too long,” she said. “Extra vitamin C, I guess, extra IM8, and I’m good to go, hopefully.”

Gauff vomited on the court on her way to a victory over Sorana Cirstea on Sunday. The American didn’t show signs of illness on Monday in her 6-4, 1-6, 7-6 (5) loss to Linda Noskova, last year’s runner-up to Sabalenka.

Sabalenka rallies

Cilic couldn’t play his match against João Fonseca on Friday.

“Unfortunately, I got food poisoning,” Cilic said. “After trying to recover all night my body is unfortunately exhausted and not at the proper level to get into the battle.”

Sabalenka rebounded from a set and a break down against Osaka in their fourth round contest.

She prevailed against No. 15 Osaka 6-7 (1), 6-3, 6-2 in two hours 20 minutes to reach the quarterfinals and stay on track to defend her title.

“Oh my God, that was an incredible level,” Sabalenka said. “She played incredible tennis. I feel like I just got lucky in a couple of shots in the third set, that’s why it went that fast. I’m happy she brought that fight, I had to fight through to level up my game.”

Sabalenka won her 15th straight match and advanced to her 17th consecutive quarterfinal. She hasn’t lost before that round since February 2025 in Dubai. The Belarusian said her team kept pushing her to “keep fighting, keep going.”

“I’m really happy that I didn’t give up and I was pushing until the very last point,” Sabalenka said.

Sabalenka will next face American Hailey Baptiste, who defeated Belinda Bencic 6-1, 6-7 (14), 6-3 after losing the second set in the longest tour-level regular tiebreaker since 2024, according to the WTA.