Simona Halep saved a match point before defeating Canadian teen Bianca Andreescu 3-6, 7-6, 6-3 at the WTA Finals in Shenzhen.
Both players sought medical treatment during the match, with Halep getting her foot treated while Andreescu had a lower back problem.
Elsewhere, defending champion Elina Svitolina stretched her unbeaten run at the season-ending tournament with a 7-6, 6-4 win over Karolina Pliskova.
Halep and Svitolina are now 1-0 in the Purple Group, while Andreescu and Pliskova are 0-1.
Newcastle secure League Cup with dominant win over Liverpool
Newcastle ended their 70-year wait for a trophy with a dominant display in the League Cup final against Liverpool at Wembley on Sunday. Dan Burn opened the scoring with a towering header before Alexander Isak struck to give the Magpies victory.
Arsenal keep alive faint title hopes with Chelsea win
Arsenal defeated London rivals Chelsea 1-0 for their first win in four Premier League games on Sunday as a headed goal by stand-in striker Mikel Merino boosted their faint hopes of catching up with runaway leaders Liverpool.
Alcaraz says nerves got the better of him against Draper
Carlos Alcaraz's hopes of capturing a third successive Indian Wells title went up in smoke on Saturday and the Spaniard said his inability to tame his nerves was more of a disappointment than the stunning semi-final defeat by Jack Draper.
Norris holds off Verstappen to win wild F1 opener in Australia
McLaren's Lando Norris swept to victory in a wet and wild Australian Grand Prix on Sunday, holding off defending champion Max Verstappen in a white-knuckle finish to a Formula One season-opener littered with crashes and safety cars.
Man City held to 2-2 home draw by Brighton
Manchester City could only muster a 2-2 Premier League draw with Brighton & Hove Albion on Saturday, dropping points in a blow to their hopes of playing European football next season.
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The Rock and Chris Evans: A Christmas Surprise!
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It arrived: The UAE's First Mega Music Festival at Expo City Dubai!
