NEW YORK—Novak Djokovic believes the US Open serve clock will soon spread to other Grand Slams.

But the 13-time Grand Slam champion isn't happy the Flushing Meadows major added the clock without consulting players.

US Open: Djokovic Survives Scalding Heat

"The shot clock thing, it is obviously now becoming an integral part of the tour, as well, ATP Tour and Grand Slams," Djokovic told the media after his first-round win over Marton Fucsovics. "I think I'm expecting all the slams now to introduce it, honestly.

"US Open has introduced it without really consulting players, which was not that nice, to be honest. At the same time a decision was made. The good thing is at least we had the US Open Series tournaments, the ATP events prior to US Open leading to US Open with a shot clock so we could get used to it."

Asked if the US Open should adjust the serve clock and give players more time on brutally hot days, Djokovic said it could help players recover. Chair umpires are supposed to start the serve clock after announcing the score.

"When a rule is implemented, it's kind of hard to just switch the shot clock off just because the conditions are difficult and brutal obviously," Djokovic said. "Yet again, if it's done, if someone makes that decision in a call, I would agree, because I understand what players are going through."

Photo credit: Christopher Levy