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.
Dimitrov marks return from pectoral injury with win in Paris
Grigor Dimitrov said he was still adjusting to the rigours of competitive tennis after three months out with a pectoral injury but the former world number three was delighted to mark his return with a victory at the Paris Masters on Monday.
Real Madrid captain Carvajal faces knee surgery setback
Real Madrid captain Dani Carvajal will undergo surgery on his right knee, dealing another blow to the defender who has battled persistent injury problems over the past year.
Simeone and Baena strike as Atletico beat Betis to extend unbeaten run
Atletico Madrid extended their unbeaten run in LaLiga to nine matches with a 2-0 victory over hosts Real Betis on Monday, courtesy of goals from Giuliano Simeone and Alex Baena.
Juventus sack coach Tudor after eight-match winless run
Juventus have sacked head coach Igor Tudor after failing to win their last eight matches in all competitions, the Serie A club said on Monday.
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