Millman's biggest beef was players on outside courts receiving less time to recover and cool down between points and at changeovers than the stars do on show courts. He pointed out that, because of ad breaks during play on televised courts, the big guns - and their opponents - were afforded 90 seconds time out. "We got 60 seconds from when the umpire calls the score. They get a minute and a half in there," he said. "Look, that's a massive difference. How's that fair? "Sixty seconds goes pretty damn quick by the time you get the towel and the ice towel around your neck."

Millman said the shot clock, which allows the server 25 seconds between points, was also unfair and should not have been introduced for the first time at a grand slam without more trialling. Loading "Especially in these conditions," he said. "The umpire starts the shot clock after he calls the score. "Well, if there's a big round of applause on centre court there, then they get, what, an extra 10, 15 seconds.

"It's got to be the same for everyone, no? "They've got a fair few teething issues and it would be nice if they don't have those teething issues at a US Open. "Probably they should sort that out." Millman also wasn't happy at only being told about 40 minutes before he took the court that, for the first time at a slam, men's players would be allowed a 10-minute break after the third set to escape the heat. "They should have maybe asked a few people because it seems like they've made up their own rules there," he said.

"Probably not the biggest fan of the 10-minute break. I don't know if it does you much good." Millman next faces either Italian 14th seed Fabio Fognini or another American wildcard, Michael Mmoh. Matt Ebden continued Australia's flying start, advancing when Serbian Filip Krajnovic became the fifth men's player to retire mid-match. Ebden was leading 7-6 (7-1) 6-7 (5-7) 4-6 6-1 4-1 when the wilting 32nd seed called it quits after three hours and 38 minutes. The West Australian's win set up a clash with German veteran Philipp Kohlschreiber.

AAP