Jannik Sinner powered into the Miami Open quarter-finals on March 25, defeating unseeded American Alex Michelsen in straight sets with a dominant 7-5, 7-6 (7/4) performance in 1 hour 41 minutes, keeping alive his bid for the “Sunshine Double” following his recent Indian Wells victory. Italian second seed Sinner will face 19th seed Frances Tiafoe in the quarter-finals after the American home hope advanced by defeating France’s Terence Atmane 6-4, 1-6, 6-4. The day’s headline result came from Spanish qualifier Martin Landaluce, ranked 151st globally, who pulled off a stunning upset over American 32nd seed Sebastian Korda with a 2-6, 7-6 (8/6), 6-4 victory, continuing his remarkable Miami run that included eliminating 14th seed Karen Khachanov. Czech 21st seed Jiri Lehecka booked his quarter-final spot by defeating American sixth seed Taylor Fritz 6-4, 6-7 (4/7), 6-2, while German third seed Alexander Zverev dispatched France’s Quentin Halys 7-6 (7/4), 7-6 (7/1). American 22nd seed Tommy Paul secured his place against Arthur Fils after dominating Argentine Tomas Etcheverry 6-1, 6-3, with Fils advancing by defeating Monaco’s Valentin Vacherot 6-4, 6-7 (4/7), 6-4. Argentina’s Francisco Cerundolo continued his upset momentum by defeating French 31st seed Ugo Humbert 6-4, 6-3 to set up a quarter-final against Zverev. In women’s action, American fourth seed Coco Gauff advanced to the quarter-finals defeating Swiss 12th seed Belinda Bencic 6-3, 1-6, 6-3, while Czech 13th seed Karolina Muchova defeated Canadian 10th seed Victoria Mboko 7-5, 7-6 (7/5).
Sinner Bids for Sunshine Double
Italian second seed Jannik Sinner maintained his quest for consecutive Masters 1000 titles by defeating Alex Michelsen in a hard-fought fourth-round match on the Hard Rock Stadium’s main court. The four-time Grand Slam champion was forced to work harder than expected against the 40th-ranked American qualifier, who proved a stubborn and competitive opponent throughout the match.
Sinner’s serving proved decisive in critical moments, particularly in the tiebreaks. The Italian star unleashed 15 aces compared to Michelsen’s three, establishing dominance on the serve that ultimately proved the difference. “I feel like I served very well in important moments and that helped me out, especially in the tough moments,” Sinner said after the match.
The opening set saw Sinner exercise patience before breaking through. After a cagey opening, Sinner began applying pressure to Michelsen’s serve in the ninth game, earning three break points. Michelsen weathered that storm temporarily, but Sinner finally converted his break opportunity in the 11th game before serving out to claim the first set 7-5.
Michelsen struck back in the second set, breaking Sinner’s serve for a 4-2 lead before extending to 5-2. However, the American appeared to struggle with the bright late afternoon sunlight glinting off the court, and Sinner capitalized on the opportunity to force a decisive tiebreak.
In the tiebreak, Sinner sealed victory with a thundering serve that Michelsen could only return wide, clinching a 7-6 (7/4) second-set victory. Sinner acknowledged the challenging conditions created by the transition from a night match the previous day to daytime competition. “I played a night match yesterday and today in the daytime, so the conditions were very different,” he explained.
With this victory, Sinner advanced to face 19th seed Frances Tiafoe in the quarter-finals, pursuing his bid to follow his Indian Wells triumph with a Miami Masters title to complete the “Sunshine Double.”
Qualifier Landaluce Shocks Korda in Upset Victory
Spanish qualifier Martin Landaluce delivered one of the tournament’s biggest surprises on March 25, upsetting American 32nd seed Sebastian Korda 2-6, 7-6 (8/6), 6-4 in a thrilling fourth-round match. The 20-year-old qualifier, ranked 151st in the world, has enjoyed a remarkable Miami run that has already included the elimination of Russian 14th seed Karen Khachanov.
Landaluce’s journey to this upset victory makes his success particularly impressive given that he had failed to register a single tour-level win in 2026 before arriving in Miami. The qualifier came into Tuesday’s match against Korda on the back of eliminating a seeded opponent, facing a player who had knocked out world number one Carlos Alcaraz in the previous round.
Korda appeared positioned to advance after earning a match point late in the second set, but Landaluce demonstrated remarkable composure under pressure, surviving the critical moment to force a deciding set. The Spaniard then captured the third set 6-4 to secure one of the tournament’s most impressive upsets.
After the victory, Landaluce dedicated his success to his late grandmother, who would have celebrated her 101st birthday the previous week before passing away months earlier. “She would have been 101 last week, and she passed away a few months ago. I wanted to give her the victory,” Landaluce said in an emotional post-match interview.
The qualifier’s quarter-final opponent will be Czech 21st seed Jiri Lehecka, setting up an intriguing matchup between two rising players seeking to advance further in the tournament.
Lehecka Defeats Fritz in Straight Sets
Czech 21st seed Jiri Lehecka advanced to the quarter-finals by dispatching American sixth seed Taylor Fritz 6-4, 6-7 (4/7), 6-2 in a two-hour 25-minute fourth-round battle. Lehecka controlled the match throughout, with his aggressive approach in the third set proving decisive.
“I just felt that in the third set, if I wanted to beat a guy like Taylor, I just needed to go for it and be aggressive,” Lehecka explained after advancing, highlighting his tactical adjustment that secured the dominant third-set performance.
American Contingent Advances
American players advanced on multiple fronts during the fourth round. Frances Tiafoe defeated France’s Terence Atmane 6-4, 1-6, 6-4, setting up his quarter-final clash with Sinner. American 22nd seed Tommy Paul posted a dominant performance against Argentine Tomas Etcheverry, cruising to a 6-1, 6-3 victory to advance against Arthur Fils.
Continental Success and Upsets
German third seed Alexander Zverev defeated France’s Quentin Halys 7-6 (7/4), 7-6 (7/1), booking his quarter-final spot where he will face Argentina’s Francisco Cerundolo. The Argentine 18th seed continued his impressive upset run, following Monday’s elimination of Daniil Medvedev with a comfortable 6-4, 6-3 victory over French 31st seed Ugo Humbert.
France’s Arthur Fils advanced to the quarter-finals by defeating Monaco’s Valentin Vacherot 6-4, 6-7 (4/7), 6-4, setting up his matchup against Tommy Paul.
Women’s Quarter-Final Advances
In women’s action, American fourth seed Coco Gauff advanced to the quarter-finals with a 6-3, 1-6, 6-3 victory over Swiss 12th seed Belinda Bencic. Gauff’s victory came in a match featuring significant momentum swings, with Bencic capturing the second set decisively before Gauff reasserted control in the decisive third set.
Czech 13th seed Karolina Muchova also advanced to the women’s quarter-finals, defeating Canadian 10th seed Victoria Mboko 7-5, 7-6 (7/5) in a closely contested match.
Quarter-Final Pairings
The quarter-final matchups now set include:
Jannik Sinner vs. Frances Tiafoe
Martin Landaluce vs. Jiri Lehecka
Alexander Zverev vs. Francisco Cerundolo
Tommy Paul vs. Arthur Fils
Conclusion:
The Miami Open fourth round on March 25, 2026, delivered compelling tennis with Italian second seed Jannik Sinner advancing to the quarter-finals in his pursuit of the “Sunshine Double” following his Indian Wells victory. Spanish qualifier Martin Landaluce captured the headlines with his stunning upset over American 32nd seed Sebastian Korda, continuing his improbable Miami run. Czech 21st seed Jiri Lehecka defeated American sixth seed Taylor Fritz, while American 22nd seed Tommy Paul, German third seed Alexander Zverev, and France’s Arthur Fils all secured quarter-final berths. In women’s tennis, American fourth seed Coco Gauff and Czech 13th seed Karolina Muchova advanced to set up intriguing quarter-final matchups. The tournament’s progression toward the final stages promises continued competitive tennis as top seeds and surprising challengers vie for championship glory in Miami.
