Daniil Medvedev accused a chair umpire on Tuesday of trying to intimidate him during his semifinal match at the China Open in Beijing on Tuesday.

The fiery Medvedev, who memorably battled with an official at the U.S. Open before his shocking first-round loss to Benjamin Bonzi last month, was accused by umpire Adel Nour of not giving his "best effort" in his match against Learner Tien and assessed a violation.

Medvedev, who split the first two sets with Tien, was down 1-0 in the third set and clearly hampered and nearly unable to walk due to cramping. With Tien serving up 30-15, Medvedev didn't attempt to return the serve, causing Nour to charge him with the violation.

According to the ATP rules, a player could receive a fine of up to $40,000 per violation. The Athletic reported that Med

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