PARIS (AP) — Top-ranked Jannik Sinner appears to be struggling with the heat during his second-round match at the French Open against 56th-ranked Argentine opponent Juan Manuel Cerundolo on Thursday.

Sinner was serving for the match at 5-4, 0-40 in the third set when he bent over on the court and then walked to his chair. He asked for assistance and left the court. Hs entire light blue outfit appeared soaked through with sweat.

When he came back with an ice pack around his neck, he proceeded to lose the next point with a poorly sliced backhand wide and lost the third set 7-5. Sinner left the court again.

He won the first two sets 6-3, 6-2.

The temperature at the start of the match was 29 degrees C (84 F), and was forecast to rise to 33 C (91 F).

Sinner is on a 30-match winning streak stretching back to February.

Sinner also struggled in the heat at the Australian Open against Eliot Spizzirri in January. The roof was closed and the third-round match swung his way.

Sinner is attempting to complete a career Grand Slam by winning his first French Open title.

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AP tennis: https://apnews.com/hub/tennis