Garcia in thrilling comeback victory

The world number eight was just two points from elimination in the 10th game of the third set but dug deep and claimed a break.

She then won the next two games to win 0-6, 6-3, 7-5 in two hours and 19 minutes at the Singapore Indoor Stadium.

Garcia will finish top of Red Group if Elina Svitolina beats top seed Simona Halep, but will be eliminated if the Romanian wins. The already qualified Wozniacki is in the final four.

"She was playing amazing in the first set, I was a little down," Garcia said after the match.

"Finally I found my rhythm but like the previous match it was up and down but I finished well."

Wozniacki seemed headed for a third straight crushing victory after dominating in the early stages through controlled aggression off the baseline, precise counter-punching and clutch serving.

The 27-year-old had just one unforced error in an almost flawless first set lasting just 22 minutes.

But the match took an unexpected turn early in the second set when the Dane had a time violation and argued with the umpire during the third game.

Garcia capitalised and won four straight games en route to levelling the match before outlasting Wozniacki in a tense third set.

It was Frenchwoman's first victory from three attempts against Wozniacki in the pair's first clash since 2015.

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World number one Simona Halep is adamant a disappointing WTA Finals campaign has not dented her confidence, maintaining Friday that she was an "improved" player.

The Romanian needed victory over world number four Elina Svitolina to reach the semifinals but suffered a 6-3, 6-4 defeat in 71 minutes at the Singapore Indoor Stadium on Friday.

It was the second consecutive loss for a shaky Halep, who had suffered a big defeat to Wozniacki in her previous match.

A defiant Halep said she would not stew over the early exit.

"I will not let this tournament ruin everything I built this year," she told reporters after the match.

"I think I improved a lot in myself and also in my game.

"I'm a different player and I'm stronger," she added.

The 26-year-old admitted to struggling with the round-robin system of the WTA Finals.

"I just talked to my coach before the match that this system, I don't like," she said.

"You stay stressed all week. I just want it to be, like, you lose, you go home."

Even though she endured disappointment in Singapore, Halep will finish the year as world number one if Karolina Pliskova does not lift the trophy on Sunday.

But she said finishing with the top ranking was not on her mind.

"I'm not thinking about being number one," she said.

"I will wait and we will see who is going to finish (number one)."

Halep said she had started to feel the effects of a long season and looked forward to a breather.

"It was like a marathon, I feel that all my energy is gone," she said.