Emma Raducanu was not able to see out victory against Dayana Yastremska at the Slovenia Open as her opponent retired when two points from defeat.
Raducanu, returning to action after a first-round loss at the US Open, where she had been the defending champion, looked set to ease past Yastremska.
The Briton did advance to the second round, but only courtesy of a premature conclusion to the match.
Raducanu led 6-2 5-3 and was 30-0 up in her own service game when Yastremska retired, complaining of a wrist injury.
Yastremska has previously been accused of gamesmanship for similar antics; of her now six career mid-match retirements, all have come with her a break down and about to lose, with four coming in a potentially decisive game.
Her decision to quit at this year's Australian Open was particularly unpopular, with Madison Brengle on the brink of inflicting a third-set bagel.
However, Raducanu did not look to criticise Yastremska after this latest contentious finale.
"Obviously no one wants to win by retirement," the top seed said. "But Dayana is an extremely ferocious competitor, so I knew it was going to be a tough match going in."
Fellow seeds Beatriz Haddad Maia, Ekaterina Alexandrova and Anastasia Potapova all also progressed in Portoroz.
At the Chennai Open, only eighth seed Chloe Paquet was subject to a scalp against Karman Kaur Thandi, with Rebecca Peterson and Eugenie Bouchard among the other victors.
Alcaraz's pursuit for third straight Madrid Open crown continues
Carlos Alcaraz boosted his hopes of a third straight Madrid Open title as he comfortably beat Thiago Seyboth Wild to reach the fourth round on Sunday.
Back in his home country of Spain, Alcaraz eased to a 6-3 6-3 triumph to set up a fourth-round clash with Jan-Lennard Struff, whom he beat in last year's final.
The first six games of the opening set went to serve, but Alcaraz found a crucial break in the seventh and ninth games of the set to put him in pole position for victory, a lead he would not relinquish as he overcame being broken in the seventh game of the second set to seal his safe progression.
Holger Rune was a surprise casualty as the world number 12 was defeated 6-4 4-6 6-3 by Tallon Griekspoor, though world number eight Andrey Rublev eased through with a straight-sets win over Alejandro Davidovich Fokina.
Data Debrief
With his triumph over Seyboth Wild at the Madrid Open, Alcaraz has now won 93.3 per cent of his games at the tournament. That is the highest win percentage of any player with at least 10 games played in a single ATP-1000 event since the format was introduced in 1990.
Against Seyboth Wild, Alcaraz won 27 of his 31 first-serve points, also recording 19 winners to his opponent's 10 as he dominated the contest on his way to victory.
Sabalenka goes the distance again to progress at Madrid Open
Aryna Sabalenka was forced to go the distance again at the Madrid Open as she battled past Robin Montgomery on Sunday.
Sabalenka, the reigning Madrid Open champion, needed three sets to win her second-round tie against Magda Linette on Friday, and the second seed did not have an easy ride against American Montgomery.
However, she eventually got over the line, triumphing 6-1 6-7 (5-7) 6-4 to tee up a last-16 meeting with Danielle Collins, who defeated Jaqueline Cristian 3-6 6-4 6-1.
Collins has now reeled off 15 straight wins, having won the Miami Open and Charleston Open in recent weeks, and has progressed to the last 16 in Madrid for the first time in her career.
The American said: "I've been doing so well the last couple of weeks, I think the girls know that when they come out and play me, they've got to go for it.
"That certainly was taking place the last two matches, some big shots that I've had to counter, and be able to react quickly."
Data Debrief: Sabalenka up there with Serena
Sabalenka has now won 14 of her 17 matches at the Madrid Open, which she won in 2023 and 2021.
Since the inception of the tournament, only Serena Williams (15) has won more of her first 17 matches at the event.
Alcaraz's pursuit for third straight Madrid Open crown continues by defeating Seyboth Wild
Carlos Alcaraz boosted his hopes of a third straight Madrid Open title as he comfortably beat Thiago Seyboth Wild to reach the fourth round on Sunday.
Back in his home country of Spain, Alcaraz eased to a 6-3 6-3 triumph to set up a fourth-round clash with Jan-Lennard Struff, whom he beat in last year's final.
The first six games of the opening set went to serve, but Alcaraz found a crucial break in the seventh and ninth games of the set to put him in pole position for victory, a lead he would not relinquish as he overcame being broken in the seventh game of the second set to seal his safe progression.
Holger Rune was a surprise casualty as the world number 12 was defeated 6-4 4-6 6-3 by Tallon Griekspoor, though world number eight Andrey Rublev eased through with a straight-sets win over Alejandro Davidovich Fokina.
Data debrief
With his triumph over Seyboth Wild at the Madrid Open, Alcaraz has now won 93.3 per cent of his games at the tournament. That is the highest win percentage of any player with at least 10 games played in a single ATP-1000 event since the format was introduced in 1990.
Against Seyboth Wild, Alcaraz won 27 of his 31 first-serve points, also recording 19 winners to his opponent's 10 as he dominated the contest on his way to victory.
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