Stefanos Tsitsipas maintained his unbeaten record in grand slam quarter-finals with victory over Jiri Lehecka to reach the last four at the Australian Open.
The third seed made it six from six in the last eight at majors with a 6-3 7-6 (2) 6-4 victory over 21-year-old Lehecka, who had never won a grand slam match before arriving in Australia.
The young Czech had defeated Cameron Norrie and Felix Auger-Aliassime to make the last eight but was broken in his first service game and, although he put on a creditable display, it was not enough to take a set from Tsitsipas.
The Greek, who along with Novak Djokovic still has a chance of finishing the tournament as the world number one, will take on Karen Khachanov in the semi-finals on Friday.
Tsitsipas said: “I’m feeling great with my tennis. I don’t think I felt so good in a long time. I’m a different player, playing different. My mentality is different. When I’m out on the court, I don’t really think of negatives, to be honest. I just go out there and play the game.”
The biggest danger to the third seed was arguably himself, with Tsitsipas reacting to a Lehecka winner in the eighth game of the third set by smacking the ball against the back fence within a couple of metres of a ball boy.
“I saw the ball kid when the ball came back,” he said. “I’m a professional tennis player. I was not aiming for the ball kid, obviously. I saw the wall, just went back towards the wall. The ball kid, in my eyes, was pretty far away from me. Would have really had to miss to hit that ball kid.
“Of course, it’s not nice even to hit it back towards the wall. I personally don’t think I hit it too hard. But it doesn’t matter. What I did, definitely I’m not happy about that. I shouldn’t have done it.”
Earlier, Khachanov reached a second consecutive slam semi-final after Sebastian Korda retired with a wrist injury when trailing 7-6 (5) 6-3 3-0.
The 22-year-old American has been one of the stories of the tournament, defeating Daniil Medvedev and Hubert Hurkacz to reach a first slam quarter-final 25 years after his father Petr lifted the trophy.
But he took a medical time-out after five games of the second set to have his wrist taped and called it quits after losing the next seven games.
“Some forehands, I couldn’t even hold the racket. Volleying was almost impossible for me. So it was a little tough.”
It has nevertheless been a breakthrough fortnight for Korda, and he added: “There is a lot of positives, way more positives than negatives. Today was tough but hopefully it’s nothing serious and I can take care of it so I don’t have it in the future.
“I’m really proud of myself. Going forward, I’m going to keep on trying to do the same thing, keep on mentally being the same way. I think I can do some really big things in the near future.”
Khachanov has lagged behind his fellow Russians Medvedev and Andrey Rublev – who will take on Djokovic in the quarter-finals on Wednesday – but went further than both at the US Open and it could be the same story here.
“Daniil was in front of us, me and Andrey, but still, Andrey was top 10,” said Khachanov. “I was top 20, top 15. At one point I think I dropped to 25 or 28, in 2021, that was the moment where I had some personal issues and tougher times, let’s say.
“Not everything was going as smooth but I always believe in myself and my abilities and what I need to do in order to be at my best.
“So I think with my team, we are on the right direction and I think this kind of competition in a positive way between us helps us to get better.”