Frances Tiafoe cursed out the umpire over a serve clock rule violation during a critical juncture in his match. Once again, the serve clock became an issue at the same tournament today. Novak Djokovic had no trouble defeating Roman Safiullin in straight sets: 6-3,

Djokovic isn't the only one who doesn't like the new rule. When it was first introduced during the grass swing, Carlos Alcaraz vowed to discuss the issue with the ATP after claiming it was "bad for players" while competing at Queen's.

The Serbian champion, in the match won against Roman Safiullin, spoke with chair umpire Ignacio Forcadell expressing his disappointment with the new rule

Novak Djokovic is the latest tennis player to express his frustration with the implementation of the serve clock rule in tournaments this season. Tennis players now have 25 seconds from three seconds after the previous point to serve the next point.

Novak Djokovic is set to take on one of his biggest fans in the last-32 of the Shanghai Open. The Serbian icon overcame American Alex Michelsen in an unexpectedly tight contest, being taken all the way in both sets before prevailing 7-6 7-6.

The 24-time Grand Slam champion has been left frustrated by a rule change that was introduced earlier this year but has only impacted him for the first time this week