Nick Kyrgios argues with Wimbledon umpire before responding with incredible ace

Nick Kyrgios was embroiled in a brief feud with the umpire during his Wimbledon second-round match against Gianluca Mager. Kyrgios was back in action at Wimbledon just a day after winning his first-round match against Ugo Humbert on Wednesday.

Mager recorded an impressive win over Juan Ignacio Londero in his first-round match.

And it set up an interesting tie between the pair with neither of them giving much away in the first set.

Kyrgios is renowned as one of the biggest serves on the ATP Tour and was causing Mager all sorts of problems.

But he got himself in a spot of bother with the score at 4-4 and was looking to hold his serve.

A line judge called a foot fault on Kyrgios for his first serve which left the 26-year-old bemused.

"I don't move my front foot at all," Kyrgios asked with a quizzical look.

He exchanged in a back-and-forth with the umpire as well as the line judge who clarified that it was for his back foot.

He replied: "So my front foot, where I don't move it at all?"

Kyrgios shook his head before returning to play for his second serve.

And the Australian tennis star responded with an incredible 135mph second-serve ace to take a 5-4 lead.

But his conversation with the match umpire didn't end there as he still couldn't believe the call.

"I don't think once in my career have I ever been called for a foot fault on my front foot ever," Kyrgios said.Back foot maybe but front foot impossible. Impossible." 

Reference: Daily Express: Stuart Ballard