Sunday delivered plenty of action and tennis quality in the males matches of Australian Open's 4th round. The highlight of the day was a match-up between Stefanos Tsitsipas and Jannik Sinner. Match, which was consideres as the best pairing in 4th round schedule has not dissapointed at all. The Greek was a favorite of this one, and confirmed his good form with confident play in first two sets, both won by 6-4. Then, it was Sinner who raised up his game and moved the momentum on his side. The Italian won two sets in a row, facing just one breakpoint in both of them, and creating as much as 18 in service games of Tsitsipas. Sinner converted just two of them, but is enough to secure the 6-3 win in 3rd and 6-4 in 4th set. When the dominant roles have reversed, it was possible, that the Italian will make another comeback from being two sets down, after a stunning performance in last three sets against Marton Fucsovics in previous round. It not happened though, as Tsitsipas regrouped himself and it the Greek was on a front foot in the decider, creating 6 breakpoints and being really well composed on his own serve. After 4:02 hours it was the world number 4 who reached the quarterfinal after great spectacle of tennis full of plot twists and quality.

Tsitsipas will face the biggest surprise of males tournament in the quarterfinal. Jiri Lehecka made an upset on Felix Auger Aliassime, defeating the favorized Canadian in four sets. FAA won the opening set as expected, being confident on serve and gaining the only one break in whole set in third game. Second set delivered the first surprise of this match, as Lehecka managed to break his opponent in 8th game and leveling the set score. Czech player was serving really well today, as we have not seen any other breaks on both sides in this match. Third and fourth set were settled in tiebreaks, both won in a dominant style by Lehecka. The player who is ranked 71 in ATP ranking was leading even 6-0 in 3rd set tiebreak, winning it 7-2. Fourth set - must win for FAA - was also ended with a dominance of Czech in a tiebreak, who won it 7-3 and crossed the line with a huge success, advancing to the quarterfinal. Tsitsipas will be a big favorite there, but Lehecka proved that sky is the limit for him in this tournament, upseting Borna Coric and Cameron Norrie before making a surprise, gaining a victory on top 10 player today.

Sebastian Korda and Hubert Hurkacz delivered another ton of tennis emotions in the five-setter won by the American. Hurkacz won the opening set, but Korda was a dominant player in the following two, moving up to the lead. The Pole gave it all in fourth set, with an impressive 6-1 win, making it to the third consecutive decider on his road in this year's Australian Open. Both players were holding their serves without a trouble until the 10th game, when Hurkacz had 40-15 on Korda's serve. The American defended himself pretty well and the super tiebreak was needed to emerge the winner. Hurkacz started with a minibreak, but Korda was more brave and confident player in the decisive points and he won it eventually 10-7 after a stunning match-point rally won after his serve.

The American will face Karen Khachanov in the quarterfinal. The Russian played a match against Yoshihito Nishioka which had quite an unusual turn of events on this level. Khachanov won first 14 games of the match, scoring two bagels on the road and moving into being break up on Nishioka in third set. Then, the Japanese found himself back into the match, scoring his first game on the scoreboard, which was a re-break at the same time. Nishioka managed to make into tiebreak, but Khachanov won it 7-4 with double mini-break, achieving Grand Slam QF after surprisingly easy win.