'invincible' Coco Gauff Keeps Cool In Melbourne Heat To Reach Australian Open Quarters

Coco Gauff said Sunday she felt 'invincible' after the recent United Cup and is not fazed about dropping her first set in nine matches this season in reaching the Australian Open quarter-finals.

The American world number three beat Switzerland's Belinda Bencic 5-7, 6-2, 6-1 on a red-hot Rod Laver Arena to set up a meeting with 11th seed Paula Badosa of Spain.

'Two out of three sets at this stage of my career is not that physically hard for me,' said the 20-year-old Gauff, who is chasing a first Melbourne title.

'The off-season I just put in so much work physically so I'm not worried at all about recovering emotionally or mentally,' added Gauff, who won all five of her singles in Perth and Sydney to lead the US to a United Cup team triumph.

'The United Cup was a little bit more exhausting because of the fact that I finished at 1:00 am one night, then had to fly across the country and play.