Federer – who is chasing his first success at Flushing Meadows since 2008 – will face Novak Djokovic should he reach the quarter-finals.
The Swiss legend dispatched Nick Kyrgios in straight sets on Saturday evening to book his place in the fourth round.
Federer has set his sights on claiming a 21st Grand Slam title and has yet to drop a set so far in the Championships in New York.
And Federer has revealed he has already practised with Millman, whom he has respect for.
“I’m a big fan of John. Maybe not that many people know him but he’s a real hard-working guy out there and those are the guys who have all the respect from us top players in the locker room,” Federer said.
“He’s just come to Switzerland to train with me before the grass-court season so we know each other quite well, a super friendly guy, and I’m very happy for him that he’s gotten so far.
“But now I’ll try to stop him, so we’ll see how it goes.”
Millman was thankful for getting the chance to hit with Federer.
He said: “Any opportunity to hit with the great man, I would take. I would pick up balls for him back then.
Roger Federer vs John Millman LIVE
FOURTH SET
Tie-break
Federer 6 – Millman 6*
Tie-break. Federer made 70, yes 70 unforced errors this match!
*Federer 5 – Millman 4
Another important hold from Federer. Can he break to level things up?
*Federer 4 – Millman 3
Federer given Millman a sniff and he’s grabbed the opportunity with both hands. Things getting tense in Arthur Ashe.
Federer 4 – Millman 2*
Federer showing why he is such a great champion. He’s got the break and turned it around in the fourth set.
*Federer 2 – Millman 1
Federer having to work extremely hard to keep Millman at bay.
THIRD SET
Millman 7 – Federer 6
Millman has taken the third set and this is incredible! Could Federer be heading out?
*Federer 6 – Millman 6
Fascinating encounter and breathless third set. We’re going onto a tie-break.
*Federer 4 – Millman 4
Still nothing separating these two men. Millman looks assured.
Federer 1 – Millman 2*
Millman is holding his own out there and he is causing Federer problems.
SECOND SET
Millman 7-5
Federer 5 – Millman 7*
Can you believe it? Federer has just lost the second set. We have a real match on!
Federer 5 – Millman 6*
What a turnaround! Millman was looking just a few minutes ago at going two sets down, but he’s given Federer something to think about!
*Federer 5 – Millman 5
Millman has done the unthinkable. He’s broken Federer who made a double fault to concede the game. Wow!
Federer 5 – Millman 4*
Federer has been forced to serve out the second set.
*Federer 5 – Millman 3
Federer is one game away from the second set. He’s in cruise mode at the moment.
Federer 3 – Millman 2*
The break has come and it has gone the way of Federer. The Swiss legend is in control.
*Federer 2 – Millman 2
No breaks as of yet in this set.
*Federer 1 – Millman 1
That was a long old game, but Federer has held. That was big!
FIRST SET
Federer 6-3
(denotes serve*)
Federer 6 – Millman 3*
Pretty simple opening set. Millman not able to answer enough questions of the Swiss legend.
*Federer 5 – Millman 2
Federer just one game away from taking the opening set. It’s been a pretty comfortable ride so far.
*Federer 4 – Millman 1
Federer looks nerveless. He already has Millman on the canvas, but can the Australian bounce back?
Federer 3 – Millman 1*
That opening set was turning into a rout, but Millman is on the scoreboard. He’ll take some confidence from that.
*Federer 3 – Millman 0
Federer was almost toiling with Millman in that game. As quick as a flash, Federer is 3-0 up in the first set.
*Federer 1 – Millman 0
Federer had a mini scare in his opening service game as he slipped and faced break point, but he is up and running.
2:15am: Federer is warming up on Arthur Ashe and his match against Millman will be starting soon. He was given a huge roar when he made his way onto court by the feverish crowd.
2:00am: Federer is facing Millman for just the second time in his career. Novak Djokovic awaits the winner in the quarter-finals.
1:50am: Maria Sharapova has been knocked OUT of the US Open losing for the first time in a night session – next up on Arthur Ashes, we’ve got Roger Federer vs John Millman. I don’t want to jinx it, but Roger is a dead cert!
