Australian Open - Cameron Norrie crashes out as Sebastian Korda shocks Daniil Medvedev

The British No 1, seeded 11th, was bidding to reach the fourth round in Melbourne for the first time but from two-sets-to-one up he was beaten 6-7 (8) 6-3 3-6 6-1 6-4 by Lehecka, a 21-year-old Czech ranked 71.

With Norrie’s top-20 status comes various earning opportunities, and he played exhibitions during the off-season in Mexico, Saudi Arabia, Abu Dhabi and Hong Kong.

He then played three matches at the United Cup to begin the season, beating Rafael Nadal and Taylor Fritz, before reaching the final of the ATP event in his home city of Auckland.

The 27-year-old, who switched allegiance from New Zealand to Britain as a teenager, only arrived in Melbourne the day before his first-round match and admitted he struggled to find his rhythm but still believes his preparation was the right one.

“It’s the best preparation I’ve ever had to play matches,” said Norrie. “The best start to the year I’ve ever had. To play in the final in Auckland, and I came in here with a load of confidence, and I think it’s perfect to play matches before then.

“Maybe I just peaked a little bit too early in United Cup. But now I think I came in here and gave myself the best chance. I think I didn’t play a very good match, and I almost won the match in five sets.

“I don’t think I would change my decision even with the result today. With the way I played, I still could have won today regardless of if I played Auckland or not.

“Ultimately I want to be playing my best tennis in the big events, and I think I gave myself the best chance.”

Norrie beat Lehecka in Auckland last week having also previously defeated him in Davis Cup but he did not look comfortable from the start in breezy conditions. Lehecka, who possesses a big serve and forehand and attacks the net well, had the better of the first set, forcing Norrie to save three break points, but could not convert a 6-4 lead in the tie-break.

Norrie showed his competitive desire to save three set points, the first with a fine pass down the line, but the 27-year-old was not playing well, missing time and again with his forehand, and Lehecka held onto an early break to claim the second set.

Norrie appeared to have found his range in the third, making only six unforced errors compared to 27 in the first two sets, but the momentum switched around again at the start of the fourth.

The 11th seed was in big trouble when he dropped serve again in the first game of the decider and called the trainer to have his left knee taped up.

Norrie fought hard to try to find a way back after going a double break down but he was unable to conjure the same magic as Andy Murray and Lehecka served the match out to love for the biggest moment of his young career.

Norrie played down the knee issue, saying: “Obviously I’ve been playing a lot. We’ve been doing some stuff to try work on it, but I don’t think it’s anything significant.

“I just need to keep getting better and work on a few lapses in concentration and keep working as hard as I can. I feel like my level, my tennis is still on an upward trajectory.

"It was a great start to the year. I’m just disappointed with the result obviously today.”

Norrie will next play for Great Britain in the Davis Cup tie in Colombia in a fortnight.

Sebastian Korda stunned Daniil Medvedev to make a statement at the Australian Open 25 years after his father Petr claimed the title.

Melbourne Park has been a happy hunting ground for the family, with Sebastian winning the junior title five years ago, while his sisters Nelly and Jessica have both won the Australian Open in golf.

While it may be too soon to talk about the 22-year-old potentially adding more silverware, he was superb in a 7-6 (7) 6-3 7-6 (4) third-round victory over seventh seed Medvedev, the beaten finalist for the last two years.

“I’m definitely the worst athlete in the family so far,” joked Korda in his on-court interview.

In his press conference later he said: “My dad always loved coming here and playing. Both my sisters, they love coming here. It’s a special place for us.”

Medvedev has struggled for form since losing to Rafael Nadal from two sets up in the final 12 months ago and was simply outplayed by Korda, who began the season by reaching the final of the ATP event in Adelaide and pushing Novak Djokovic all the way.

Stefanos Tsitsipas, at three now the highest seed left, continued his serene progress through the draw to set up a rematch with Jannik Sinner. He is yet to drop a set and defeated another in-form player in Tallon Griekspoor 6-2 7-6 (5) 6-3.

Mackenzie McDonald was unable to follow up his big victory over Nadal, struggling with an injury himself and resorting to underarm serves in a 7-6 (6) 6-3 6-2 loss to Yoshihito Nishioka. Sixth seed Felix Auger-Aliassime made a good start in a 6-1 3-6 6-1 6-4 victory over Francisco Cerundolo while Hubert Hurkacz defeated Denis Shapovalov and Karen Khachanov beatFrances Tiafoe.