Sofia Kenin admitted she was given a stern test by Kirsten Flipkens before the Belgian was forced to abandon their tussle at the Abu Dhabi Women's Tennis Open.
With a month to go before Kenin begins the defence of her Australian Open title, the American world number four was fighting to avoid a second-round exit to an experienced opponent.
Flipkens took the first set 7-5 and trailed 5-4 in the second, a break down, when an injury to her left ankle caused her to retire from the match.
A run of three consecutive games and 12 unanswered points from Flipkens had seen the 34-year-old former Wimbledon semi-finalist snatch the opener.
Kenin was turning the contest around in the second set and the top seed admitted she was "a little bit upset" to see Flipkens suffer when injury struck.
"We're good friends and that's not something you like to see," Kenin said, quoted on the WTA website. "I just hope [Flipkens] can have a speedy recovery and get ready for Australia.
"She played a really good match. It was the third time we’ve played each other, and it was a really solid match from both of us. This is not the way I wanted to win."
Aryna Sabalenka could be a player to fear at Melbourne Park in February, as the world number 10 made it 11 consecutive match wins by fending off Australian Ajla Tomljanovic 7-5 6-4.
Sabalenka finished off the 2020 season with titles in Ostrava and Linz so the Belarusian is looking for a hat-trick of tournament triumphs.
Tunisian Ons Jabeur scored a 5-7 6-3 6-2 victory against Kateryna Bondarenko of Ukraine to reach the last-16 stage, and she faces Sabalenka next.
Jabeur won on the only previous occasion she and Sabalenka have met, securing a three-set win in round three of the delayed 2020 French Open.
Nadal slumps out of Madrid Open as farewell appearance comes to a halt
Jiri Lehecka claimed a memorable win over one of tennis' greats as he downed Rafael Nadal at the Madrid Open.
Nadal's farewell appearance at the tournament he has won five times came to an end with a 7-5 6-4 defeat on Tuesday.
The 22-time grand slam champion had been hoping to tee up a quarter-final against Daniil Medvedev.
Ultimately, though, world number 31 Lehecka was the man who progressed.
Lehecka ruined the hopes of the Nadal fans packed into the stands in the Spanish capital, and took control when he reeled off 10 straight points to take the opening set.
Nadal won the Madrid Open in 2008, 2010, 2013, 2014 and 2017, and said farewell to the crowd in an on-court interview following his defeat.
Data Debrief: Nadal falls short of milestone
Nadal had been hoping to win his 60th match at the Madrid Open, while he would have reached his 100th ATP Masters 1000 quarter-final had he won. This was his first defeat to a player ranked lower than 20th in the world since he went down to Pablo Cuevas in 2016.
Lehecka, meanwhile, will make his second appearance in the last eight of a Masters 1000 event.
Auger-Aliassime gets the better of Ruud as Medvedev hits Masters 1000 milestone
Casper Ruud's hopes of building on his victory at the Barcelona Open were ended as he lost to Felix Auger-Aliassime at the Madrid Open.
Auger-Aliassime will now face top seed Jannik Sinner in the quarter-finals, after claiming a 6-4 7-5 victory over the fifth seed Ruud on Tuesday.
Ruud, runner-up at last year's French Open and a force to be reckoned with on clay, won in Barcelona earlier in April, but came unstuck against the Canadian.
It was not the only shock exit, as Alexander Zverev, the world number five, succumbed in straight sets to Francisco Cerundolo.
Earlier, Daniil Medvedev claimed his place in the quarters, in which he could face Rafael Nadal, by beating Alexander Bublik 7-6 (7-3) 6-4.
Data Debrief: Medvedev's milestone
Five of the six quarter-finals Medvedev has reached on clay have come at either ATP Masters 1000 or grand slam level.
He has now reached at least the quarter-final stage at all nine Masters events, too.
Alcaraz matches Nadal record as reigning champion scrapes into Madrid Open quarters
Jan-Lennard Struff made life difficult for Carlos Alcaraz, but the reigning Madrid Champion eventually made it through.
Alcaraz had won both of his opening games with the minimum of fuss, but he needed three sets to get beyond Struff, who won a second-set tie-break.
However, Alcaraz eventually prevailed in the decider, clinching a 6-3 6-7 (5-7) 7-6 (7-4) victory.
Alcaraz, who is in the hunt for a third straight title in Madrid, will now face seventh-seed Andrey Rublev for a place in the last four.
Data Debrief: Prodigal son matches the master
There have been plenty of comparisons between Alcaraz and his fellow Spaniard Rafael Nadal.
And with his win on Tuesday, Alcaraz matched Nadal's record for the longest winning run at the Madrid Open, at 14 matches, since the tournament began in 2002.
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