Like her ex-fiance, tennis ace Caroline Wozniacki can hardly stop winning since splitting with top-ranked golfer Rory McIlroy.
Wozniacki continued her summer resurgence on Sunday with a stirring three-set victory over Maria Sharapova to emerge as Serena Williams' biggest US Open title threat.
Wozniacki's 6-4 2-6 6-2 fourth-round triumph at steamy Arthur Ashe Stadium was her first success over the French Open champion since 2011, when the Dane was enjoying a 67-week stint as world No.1.
But the 24-year-old had only reached two quarter-finals from a dozen majors since those heady days until Sunday in New York.
"It means so much to me," said Wozniacki, engaged to McIlroy in Sydney last New Year's Eve before breaking up in May.
"To win today against a champion like Maria is an unbelievable feeling."
Coincidence or not, Wozniacki is well and truly back at the top of her game after McIlory panned the couple's wedding plans days after the invites went out.
The 2009 Open runner-up landed her 22nd career title in Istanbul in July, reached the semis in Montreal, quarters in Cincinnati - stopped by Williams both times in three sets - and is now back in the last eight at Flushing Meadows for the first time in three years.
McIlroy, too, is back in the swing.
The week after ending sport's big love match, the Northern Irishman won the BMW PGA Championship at Wentworth - his first victory on either of the sport's two major tours in 18 months.
Two majors at the Open and PGA Championship later, plus another title at the WGC Bridgestone Invitational, and McIlroy is on top again as world No.1.
Wozniacki wasn't ready to discuss the "elephant in the room" after her latest big win, but admitted her dalliance with golf had helped her tennis in some way.
"Golf is obviously a mental sport," she said.
"Sometimes it's the small putts that can make a huge difference. You make a few putts here and there.
"Again, same with tennis. You make a ball here, there. You know, important points, those are the ones that count."
They counted on Sunday when Wozniacki booked a quarter-final with Italian 13th seed Sara Errani, who ended the magical run of 32-year-old qualifier Mirjana Lucic-Baroni 6-3 2-6 6-0.
The departure of fifth-seeded Sharapova leaves just two of the women's top eight - world No.1 and two-time defending champion Williams and seventh-seeded Canadian Eugenie Bouchard.
Lucic-Baroni, ranked 121st in the world, accounted for the third-round exit of world No.2 Simona Halep.
But the Croatian, a teen sensation in the 1990s whose career was derailed by the trauma of an abusive father, financial troubles and injury, couldn't sustain her inspired run.
After a storm delay, China's unfancied Peng Shuai and exciting Swiss teenager Belinda Bencic set up an unlikely quarter-final with victories over seeded opponents.
Peng, who had toppled world No.5 Agnieszka Radwanska in the second round, upended 14th-seeded Czech Lucie Safarova 6-3 6-4 while Bencic ousted Serbia's former world No.1 and ninth seed Jelena Jankovic 7-6 (8-6) 6-3.
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