Roger Federer wants a crackdown on tennis time-wasting, a plea which coincided with claims that the majority of the world's top umpires have boycotted the US Open in a row over pay and conditions.
Federer believes there are improvements to be made on court to improve the spectacle and the sport's attraction to fans.
"If you look at how much time we can take walking onto the court until the first ball is hit and there are many times where it takes way too long between points," said Federer.
"I think officials should and could be more strict. Sometimes I wonder if they're more strict on the outside courts than on the big courts, even though on the big courts you kind of give some leeway to players.
"I've felt like this last six months they've been trying to speed up the warmups. I think that's good, because I think it's a bit of a waste of time, to be quite honest, this whole pre-warmup and stuff.
"I think they try to understand the players, too. Some don't; some do. It's a tough call. It's important also that we are good role models. Otherwise it gets out of control again and people use too many things trying to win, which is unfair."
Federer was speaking after reaching the third round with an easy 6-3, 6-2, 6-2 win over Israel's Dudi Sela to set up a meeting with Croatia's Marin Cilic who defeated Australian teenager Bernard Tomic 6-1, 6-0, 6-2.
His calls for a cull on time-wasting on court came as reports emerged that most of the world's best umpires had boycotted the US Open, the season's last Grand Slam tournament.
The Fox Sports network claimed on its website that only 13 of the leading chair umpires had made it to New York; at Wimbledon this summer, 24 of the top 26 had been on duty.
The report claimed that the US Open pays the lowest rate -- around $250 a day -- of all the four Grand Slams.
"I wish that all the best umpires would be here, but it is what it is, and I hope they can resolve the issue," said Federer.