Jannik Sinner advanced to the quarterfinals of the Australian Open 2026 with a straight-sets victory over compatriot Luciano Darderi, 6-1, 6-3, 7-6(2). The match was marked by Darderi's frustration leading to a code violation and Sinner's removal of a banned fitness tracker before play. Sinner now awaits the winner of Ben Shelton versus Casper Ruud.
Jannik Sinner, the world No. 2 and two-time defending champion, secured his place in the Australian Open quarterfinals on January 26, 2026, at Margaret Court Arena in Melbourne. Facing fellow Italian Luciano Darderi in an all-Italian fourth-round clash, Sinner dominated with a 6-1, 6-3, 7-6(2) win, firing 19 aces and winning 81% of his first-serve points. He converted four of eight break points while Darderi managed none from six opportunities, finishing with 46 winners to Darderi's 33 and 16 fewer unforced errors.
The match was not without drama. Darderi, ranked No. 25, struggled with frustration early on, hurling his racket after a second-set error and later launching a spare ball out of the stadium, earning a code violation for unsportsmanlike conduct. He also shouted toward his player's box and appeared to nearly bite the ball in anger. Commentator Jo Durie noted, “And he’s absolutely seething. What can you do? Where can you go?” This outburst followed Darderi's own cramping episode during a post-match interview after upsetting Karen Khachanov in the previous round.
Before the match, Sinner was asked by the umpire to remove his WHOOP wristband, a screenless fitness tracker monitoring heart rate, recovery, and strain—devices banned at Grand Slams despite ATP approval for regular tour events since 2024. Sinner explained in his press conference, “Yeah, there is a certain data we would like to track a little bit on court... It’s not for the live thing, but it’s more about what you can see after the match.” He added, “Rules are rules, and I understand and won’t use it again.” Carlos Alcaraz faced the same issue earlier against Tommy Paul, stating, “You can’t play with it... You take it off and keep going.” The International Tennis Federation classifies WHOOP models as approved for analysis but not Grand Slam use, sparking debates on player welfare and data access.
Sinner's path included a grueling third-round win over Eliot Spizzirri amid 38-40°C heat, where full-body cramps nearly ended his campaign. The Extreme Heat Policy prompted a roof closure at the end of the third set, providing relief. Coach Darren Cahill said, “Jannik did get a little lucky when the roof was closed... that was one of the best three or four performances I’ve seen from him.” Recovery has been routine, with a 40-minute indoor hit, and Cahill denied requesting a night session despite the offer, a claim disputed by doubles champion Jamie Murray: “I don’t believe it... There’s no way he went through what he went through and then they didn’t want him to play as late as possible.” Former player Steve Johnson criticized the heat rule as “insane” for interrupting mid-set.
Sinner, extending his Melbourne winning streak to 18 matches, reflected on the tactical challenge against a friend: “It was very very difficult... I’m very happy I closed it in 3 sets.” He aims for a third straight title, emphasizing recovery ahead of the quarters.
