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.
Punjab crack under pressure to leave IPL playoffs hopes in balance
Punjab Kings set the early pace in the Indian Premier League by going seven matches unbeaten, but a run of five straight defeats has left their playoffs hopes in the balance and assistant coach Brad Haddin concedes they have failed to deal with the pressure.
Mbappe booed on return as Real Madrid beat Oviedo 2-0
Kylian Mbappe was greeted with a chorus of boos and whistles from Real Madrid's own fans as he returned from a hamstring injury during his side's 2-0 LaLiga home win over Real Oviedo on Thursday.
Ireland's McCabe to leave Arsenal at end of season
Ireland captain Katie McCabe will leave Arsenal at the end of the season when her contract expires, bringing an end to a spell of more than a decade at the north London club.
Scheffler, Potgieter in seven-way tie for PGA Championship lead
World number one Scottie Scheffler and former champion Martin Kaymer has joined Aldrich Potgieter in a seven-way share of the first-round lead at the PGA Championship on Thursday at Aronimink Golf Club.
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