Kevin Anderson says he just ‘went after it’ when he was a match point down against Roger Federer in their quarter-final at Wimbledon on Wednesday.

Trailing by two sets to love, the South African was a match point down on his own serve at 4-5 when he attacked the net and Federer mistimed a backhand.

Anderson went on to claim a famous 2-6, 6-7, 7-5, 6-4, 13-11 win – his first against the Swiss legend – to reach a maiden Wimbledon semi-final.

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‘I think I remember the point pretty well. The ball was there to be hit. [I] went after it. Had a good first serve, as well. By that stage, I felt I was hitting the ball well. Obviously, it was important for me to get through those tight moments. But I feel like my commitment to the kind of tennis I wanted to play throughout the match, got definitely better as the match progressed,’ Anderson said at his post-match press conference.

‘I felt the first set obviously wasn’t great for me. I was a little bit unsettled starting the match out. I thought I settled down much better in the second set. Even though I lost it in a tie-break [7-5], I felt I played a much, much better set of tennis.

‘Obviously, in the third set, I just tried to compete as hard as I could. I was able to, you know, hold serve throughout. Obviously [he] had that one match point, but [I] played a good point, [and] was able to get that break. I feel like once I did that, I really settled down well and felt pretty comfortable out there.’

WATCH: Anderson vs Federer highlights

Anderson will play America’s John Isner, who beat Canada’s Milos Raonic 6-7 (5-7), 7-6 (9-7), 6-4, 6-3, in the semi-finals.

‘John, I think has got arguably one of the best serves of all time on the tour,’ said Anderson. ‘Especially in the last few months what’s really impressive is just his first-serve percentage as well, never mind how accurate and big the serve is. But he’s very consistent with the two. Definitely, the first challenge is the serve.

‘I feel like he relies a lot on confidence. Especially after his win in Miami, sort of just seeing him around, watching him play matches on the practice court. I think he has a lot of confidence right now which allows him to be a bit more free from the baseline, from the back.

‘In the matches I’ve played him, obviously taking care of your serve is the first priority. It’s a match that’s often won on just a couple points here and there. I feel confident in sort of baseline exchanges I’d say quite a lot with John. At the same time, because he’s such a big player, has so much firepower, you just can’t be too patient. You have to still be aggressive, put him on the back foot.’

Isner leads their head-to-head encounters 8-3 on the ATP World Tour.