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.
Desert Vipers defeat Sharjah Warriorz by 10 wickets in ILT20
The Desert Vipers got back to winning ways in the DP World ILT20 as they put up a scintillating performance to outclass the Sharjah Warriorz, and clinch a massive 10-wicket victory at the Dubai International Stadium on Wednesday.
India blitz England led by Abhishek's superb hitting
Opener Abhishek Sharma's sensational power-hitting secured India's comprehensive seven-wicket victory against England in the opening T20 International at the Eden Gardens on Wednesday.
Sinner crushes De Minaur in Melbourne
Defending champion Jannik Sinner shattered home hopes Wednesday by crushing Alex de Minaur in a straight-sets rout to tee up an Australian Open semi-final against Ben Shelton.
Struggling Dortmund sack coach Sahin
Borussia Dortmund have fired coach Nuri Sahin, the German football club said on Wednesday, after Tuesday's shock 2-1 loss to Bologna in the Champions League that stretched their losing run to four games across all competitions.
Swiatek, Keys charge into Australian Open semis
A rampaging Iga Swiatek stormed into her second Australian Open semi-final with a 6-1 6-2 centre court demolition of eighth seed Emma Navarro on Wednesday, while Madison Keys overhauled Elina Svitolina 3-6 6-3 6-4 in the earlier quarter-final.
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