Garbine Muguruza, 20, adds Simona Halep to list of upset victims; Serena retires at Wuhan Open

Garbine Muguruza stunned second-seeded Simona Halep out of the Wuhan Open on Tuesday, coming back for a 2-6, 6-2, 6-3 victory in the second round.

Muguruza, who beat top-ranked Serena Williams in the second round at the last French Open, dropped the first set in 35 minutes but won the first four games of the second set and the last four games of the third to advance at the inaugural Wuhan tournament.

Also, Alison Riske of the United States recovered an early break to beat No 11-seeded Sara Errani of Italy 6-4, 6-4, and Swiss qualifier Timea Bacsinszky defeated US Open semi-finalist Ekaterina Makarova 6-4, 6-1.

Eighth-seeded Caroline Wozniacki beat Carla Suarez Navarro of Spain 6-1, 3-6, 7-6 (4).

Top seed Serena Williams had to be helped from the court as she retired ill during her first set.

The world No 1 had her temperature and blood pressure checked before retiring while 6-5 up against France’s Alize Cornet, after just over an hour on court.

It brought an abrupt end to Williams’ first match since she won her 18th Grand Slam title at the US Open in New York two weeks ago.

The incident is another heavy blow for the Wuhan Open after poster girl and hometown hero Li Na quit tennis over injuries on the eve of the tournament.

Garbine Muguruza, 20, adds Simona Halep to list of upset victims; Serena retires at Wuhan Open

The Spanish rising star, who beat Serena Williams in the French Open second round earlier this year, dismissed Halep after losing the first set on Tuesday at the inaugural Wuhan event.