Diego Schwartzman sealed a 2-0 win for Argentina over Greece in Group D of the ATP Cup after edging a close contest with world number four Stefanos Tsitsipas.
Schwartzman claimed just the third victory of his career over a top-five opponent, winning 6-7 (5-7) 6-3 6-3 in Sydney.
The world number 13 fought back from a break down in the second set before taking his career head-to-head with Tsitsipas to 2-1 after battling through two hours and 42 minutes on Ken Rosewall Arena.
"I was just trying to think that it was his first match for two months after his elbow [injury], so I was thinking just to try and be in the match," Schwartzman said in his on-court interview.
"I had the chance and I think I was ready. I am very happy because playing against Stefanos and being a set and a break down is not easy, but I found a way."
Argentina, who earlier saw Federico Delbonis defeat Michail Pervolarakis in straight sets, will now face Poland on Wednesday to decide who progresses to the semi-finals.
Poland were comfortable 3-0 winners in their match-up with Georgia, Kamil Majchrzak beating Aleksandre Bakshi for the loss of just two games before Hubert Hurkacz defeated Aleksandre Metreveli 6-7 (5-7) 6-3 6-1.
Pablo Carreno Busta beat Viktor Durasovic 6-3 6-3 to put Spain ahead against Norway, and their win was assured when Roberto Bautista Agut claimed an impressive 6-4 7-6 (7-4) victory over Casper Ruud. Alejandro Davidovich Fokina and Pedro Martinez followed up with a straight-sets doubles win.
"Casper is playing unbelievable tennis, [he did] an unbelievable performance last year, and today I played very good," Bautista Agut said. "I returned very well, I made very few unforced errors and I played aggressively. I try to play matches like this and that is why I am practising hard and I am trying to show this level."
Spain are top of Group A ahead of Serbia, whose match with Chile will go down to a doubles decider.
Osaka eliminated by Samsonova in Madrid
Naomi Osaka was knocked out of the Madrid Open by Liudmila Samsonova after an entertaining second-round battle on Thursday.
Having won her first match on clay for two years against Greet Minnen a day earlier, Osaka was able to force a final set against 15th seed Samsonova but ultimately fell to defeat.
Samsonova won a close encounter 6-2 4-6 7-5 to book a clash with American Madison Keys – who defeated Irina-Camelia Begu in straight sets – in the next round.
Osaka had beaten Samsonova at Indian Wells last month and came close to securing another victory as she recovered well from losing the opening set.
But the Japanese star was broken to fall 5-6 behind in the final set, and the Russian made no mistake in ruthlessly closing out the victory.
Data Debrief: Samsonova ends losing streak
This was a crucial win for Samsonova, who came into the match having lost four consecutive contests, including that Indian Wells defeat to Osaka on March 9.
Samsonova did apply plenty of pressure in the final set – forcing five break points compared to just one for Osaka – and was ultimately rewarded in the closing stages of a contest that lasted two hours and 22 minutes.
Azarenka makes history with 200th WTA 1000 win
Victoria Azarenka made light work of progressing into the round of 32 at the Madrid Open and she made history in the progress.
Azarenka, a two-time finalist in Madrid, despatched Tatjana Maria 6-3 6-1 on Thursday.
It brought up her 200th victory at WTA 1000 events, which makes her the first woman to hit that milestone since the format was introduced in 2009.
The former world number one needed just 81 minutes on court to get the job done, and will face Sara Sorribes Tormo in the next round.
Data Debrief
This was Azarenka's first meeting with Maria, and her service game was excellent, with the Belarusian winning 63.2 per cent of her first-serve points. She also saved five break points, having offered up seven, and converted six going the other way.
Azarenka, who has won 10 WTA 1000 events, is 14 clear of next-best Simona Halep (186) on the list of women with the most WTA 1000 match wins.
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.
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