Beijing, September 29: China Open organisers faced questions after two-time Grand Slam champion Garbine Muguruza lost in a match which did not start until nearly 1:00 am and concluded at 2:31 am Sunday.

The Spaniard's conqueror Sofia Kenin said that she felt "mentally drained" following the late-night first-round encounter in Beijing, which the American won 6-0, 2-6, 6-2.

"I obviously started out really well in the first set and I knew that she was going to pick up her game," the 15th seed told the official WTA website. Simona Halep Confirms Participation in China Open 2019.

"I just felt pretty tired, mentally drained, but I'm happy that I somehow found a way to just fight through it.

"The support from the crowd was great, even at 2:30 in the morning, surprisingly," added the Moscow-born Kenin.

Her clash with Muguruza, 25, who won the 2016 French Open and Wimbledon a year later, was delayed after all four previous matches on the main Diamond Court went to three sets.

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