Great Britain’s Jacob Fearnley claimed the biggest win of his career at the Australian Open with a straight-sets victory over Nick Kyrgios.

Home favourite Kyrgios, the 2022 Wimbledon finalist, was handicapped by an abdominal strain as Fearnley prevailed 7-6 (3) 6-3 7-6 (2) in two hours and 19 minutes in Melbourne.

The controversial Kyrgios was playing his first grand-slam event since the 2022 US Open after recovering from chronic wrist and hip injuries.

“I was extremely nervous before the match and I didn’t get too much sleep,” Fearnley said in his on-court interview.

“I knew it was going to be a rowdy match. I thought I played good.

“I’m sorry for Nick, I knew he was dealing with some stuff but he played some unbelievable tennis and I thought it was a great match.

“I just tried to focus on myself as best as I could. All things considered it’s probably the best match I’ve ever played.

“I’ve had a few heckles thrown my way in (American) college tennis but this was something I’d never experienced before.”

Fearnley had admitted to feeling anxious about playing Kyrgios on Australian soil, acknowledging that the partisan Melbourne crowd would be against him.

The world number 92 was seeking to take another huge step in his second grand slam – the 23-year-old lost to Novak Djokovic in the second round at Wimbledon last year – following a spectacular rise through the rankings.

Kyrgios saved two break points at 3-3 in the first set, but a couple of grimaces revealed his inner turmoil and the Australian began suggesting that he should not be playing through the pain barrier.

Fearnley was unruffled as Kyrgios’ complaints grew louder and the language directed at his team courtside became more colourful.

The British number three dominated the tie-break with a series of explosive forehand winners and it was the same script in the second set.

The Scot broke early and Kyrgios’ discomfort was clear as he twice called for medical assistance during game breaks.

Kyrgios told his team at the end of the second set that he would “keep going until I can’t anymore”.

The end looked nigh when Kyrgios missed a routine volley at the net and Fearnley broke for a 2-1 lead in the third set.

But Kyrgios broke back for 3-3 before an underarm serve and a spot of showboating got the John Cain Arena crowd on its feet.

Amid see-saw drama Fearnley had break points in successive games and Kyrgios, despite requiring more medical attention, had a set point when 5-4 ahead.

None were taken before Fearnley finally broke Kyrgios’ resistance in a one-sided tie-break.