The No. 5 seed dropped just five games to beat the Romanian on Day 2, as Wimbledon champion Marketa Vondrousova also won. Linda Noskova upset No. 10 seed Jelena Ostapenko.

“This has to be the biggest comeback of my career,” Cirstea said after rallying from 6-2, 5-1 to defeat the reigning Wimbledon champion 2-6, 7-6 (1), 6-2 and book her spot in the semifinals.

It was also the milestone 20th Top 10 win of her career.

Fellow ATP Finals contenders Tsitsipas and Rune headline Antwerp and Stockholm; Fernandez looks to build on her Hong Kong triumph at Nanchang.

What’s the point in having a rigorous anti-doping program anyway, if so many people simply refuse to accept the result?

The Czech, a finalist at Roland Garros, reached the US Open semifinals in commanding fashion.

Plus, picks for Gauff vs. Ostapenko, Muchova vs. Cirstea and Tiafoe vs. Shelton.

The 33-year-old defeated Belinda Bencic, 6-3, 6-3, on Sunday to set a US Open clash with Karolina Muchova.

The Romanian took out No. 4-ranked Elena Rybakina in the third round of the US Open on Friday night.

The No. 30-seeded Cirstea won 6-3, 6-7 (6), 6-4 to reach the fourth round in Flushing Meadows for the first time.