Players Collapsing on Court in Miami

(INSIDER) 19-year-old British tennis star Jack Draper was forced to retire early from his ATP Tour debut after he appeared to collapse mid-point during the first set.

Facing Mikhail Kukushkin in the first round of the Miami Open in sweltering 86°C conditions on Thursday, Draper was trailing 5-6 when he had his heart-rate checked by medics as he visibly struggled to cope with the heat.

Shortly after opting to play on, his legs buckled under him as he chased a return-on-set point, and he appeared to collapse, though video footage suggests he didn't lose consciousness.

Medics ran to his attention, treating him with an ice pack before he was able to leave the court unaided and the walkover was awarded to Kukushkin.

Ons Jabeur falls Sick but STILL WINS

Facing off against young Spaniard, Paula Badosa, Ons Jabeur was the definition of courage in Miami this past week. After, supposedly, throwing up on the side of the court during Badosa's serve game, she was still able to break and take home the win while collapsing next to her chair post-match.