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.
New Zealand crush South Africa to reach T20 World Cup final
Finn Allen plundered the fastest century in Twenty20 World Cup history to lead New Zealand into the final with a nine-wicket demolition of South Africa at the Eden Gardens on Wednesday.
Dave Rennie becomes first Pacific Islander to lead All Blacks
Dave Rennie was named as replacement for Scott Robertson as coach of the All Blacks on Wednesday and charged with taking New Zealand to a fourth World Cup triumph in Australia next year.
FIFA offering $12 tickets to World Cup Play-Off Tournament
Tickets for this month's World Cup Play-Off Tournament matches in Mexico, which will determine two of the final six vacant spots in this summer's historic 48-team tournament, went on sale Tuesday.
Resurgent Wolves stun Liverpool, Everton enjoy home comfort
Resurgent bottom club Wolverhampton Wanderers have stunned Liverpool with a last-gasp 2-1 win at a rocking Molineux on Tuesday to offer a glimpse of a miraculous escape from relegation while putting a big dent in the top-five hopes of Arne Slot's side.
Real Madrid's Rodrygo to miss World Cup for Brazil
Real Madrid forward Rodrygo has a ruptured ACL and meniscus in his right knee, likely keeping him out of this summer's World Cup for his native Brazil.
