Federer fluffs his lines in epic promo fail

Roger Federer is human after all, as he showed by struggling through some pretty easy lines for a Channel 7 promo.

As you can see in the video above, Federer was supposed to say 'Watch the summer of tennis on Channel 7 and the 7Tennis app'.

Pretty easy right? Apparently not for the great Federer.

The World No.2 fluffed his lines on multiple occasions before finally getting it right, making for some pretty hilarious viewing.

The video at the top is reminiscent of this classic from 2010, in which Federer and Rafael Nadal can't stop laughing.

Federer is supposed to ask Nadal what he's getting him for Christmas, but it all goes hilariously wrong.

He may be struggling off court, but Federer is in fine form on it.

Federer and Belinda Bencic are undefeated so far in the Hopman Cup and take on USA next for a spot in the final on Saturday.

Hopman Cup organisers are confident America's Jack Sock will be fit to play in Thursday night's sell-out clash with Federer at Perth Arena, despite his hip injury.

"I think he'll be fine," Federer said of Sock.

"There was no reason for him to take a major chance on his health so short before the Australian Open (in his match on Tuesday).

"We'll see all the players having this kind of a thought moving forward in the next 10 or 12 days, because you don't want to get hurt now.

"I think he should be OK with a day's rest. At least I hope so."

Sock is ranked eighth in the world and will give Federer his biggest test of the summer so far.

Federer is yet to drop a set at the Hopman Cup, disposing of Yuichi Sugita and Russian Karen Khachanov in his first two singles matches.

with AAP