Caroline Wozniacki rolled past top-ranked Simona Halep 6-0, 6-2 at the WTA Finals in Singapore on Wednesday, moving to 2-0 in the round-robin tournament.
The former No. 1 from Denmark made only seven unforced errors in the match against Halep of Romania. The sixth-seeded Wozniacki has dropped just four games in two matches.
In the other Red Group match, Caroline Garcia of France defeated Elina Svitolina of Ukraine in three sets to stay alive, winning 6-7 (7), 6-3, 7-5 after a two-hour, 45-minute battle.
On Friday, Svitolina faces Halep and Garcia takes on Wozniacki to determine who will advance from the Red Group.
With the victory at the Singapore Indoor Stadium, Wozniacki has recorded three wins against world No. 1 players in 2017, having defeated Garbine Muguruza en route to winning the Pacific Open in Tokyo and Karolina Pliskova at the Rogers Cup in Toronto.
"I don't think it's ever easy when you play a world No. 1," Wozniacki said after the match. "I thought I played really well out there. I felt comfortable and played aggressive when I needed to and ran the balls down when I needed to. I was happy with that."
Wozniacki broke Halep five times in eight opportunities, hitting three aces and nine winners, and saved the lone break point she faced against Halep, who is now 1-1 in the event.
"I think it was one of my bad days. I made too many mistakes and she didn't miss," Halep said. "I did some good shots, good points, and I missed too many to win a match. After the first set, in the second set I felt that I can come back a little bit at 4-2 -- it was a good game, but it was too late."
The eight-seeded Garcia was pleased with another win over No. 4 Svitolina in a rematch of their China Open epic earlier in the month.
"This was an incredible battle, the last match I had against Svitolina was already very long, and this one was the same," Garcia said in her on-court interview. "It was a battle on every single point, and I'm just happy to be through."