Novak Djokovic battled through a left leg injury and heat exhaustion to beat Jaume Munar 6-3 5-7 6-2 to reach the quarter-finals at the Shanghai Masters on Tuesday.

Djokovic, 38, had to take a medical timeout after picking up the injury during the first set of an encounter that stretched to two hours and 41 minutes. He also struggled with the heat and medics checked his vitals at one point, as the temperature stayed near 30 degrees Celsius and humidity hovered around 80 per cent.

The Serbian had also vomited during his match against Yannick Hanfmann on Sunday, the same day world number two Jannik Sinner retired due to cramps.

The 38-year-old had called the conditions "brutal" earlier in the tournament.

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