Caroline Wozniacki thrashed world number one Simona Halep to reach the WTA Finals last four in Singapore.

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Wozniacki, who beat Elina Svitolina in her first match, broke Halep's serve five times in a victory that secured progress from Red Group.

Caroline Garcia won the last four games to beat Svitolina 6-7 (9-7) 6-3 7-5 in Wednesday's other Red Group match.

The result means any one of Halep, Garcia or Svitolina could join Wozniacki in the semi-finals depending on the results of Friday's last robin-round matches.

Garbine Muguruza and Venus Williams will play for second qualifying spot on Thursday.