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Sinner Fires up in the Heat to Reach Australian Open Quarter-Finals

Jannik Sinner advanced to the Australian Open quarterfinals with an 18th straight win at the event amid controversy over his use of a banned Whoop device.

  • On Saturday, defending champion Jannik Sinner returned to the Australian Open quarter-finals, racing to a 6-1 lead in 27 minutes as he ramped up through the levels.
  • Sinner ramped up his level with aggressive serving and winners, dominating behind serve while Matteo Darderi's double-faults, frustration, and limp prompted a trainer call by Greg Allensworth.
  • Sinner was spotted wearing a Whoop device, the same banned wearable linked to Carlos Alcaraz being busted, while Matteo Darderi launched a ball into row Z and kneed a ball away in frustration.
  • Sinner will now serve for the set and head inside for an ice bath before possible quarter-final opponents Ben Shelton or Casper Ruud take to court, while Matteo Darderi, about to become No 18, deals with a limp.
  • Tournament scrutiny continues as Sinner, with a 17 record against Italian opposition, was spotted wearing a Whoop device after Alcaraz was busted by officials.
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Chair judge Greg Allensworth visualized a strange object on Jannik Sinner's arm and demanded his surrender to begin the match against Luciano Darderi at Rod Laver Arena. The tennis player wore a bracelet outside the official clothing hidden under the wristband and complied without objection to contest the duel.What's the use of the bracelet that had Sinner pulled out before the match?The Italian used a model of the Whoop brand, a technology that…

·Buenos Aires, Argentina
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Before the challenge against Darderi the chair judge asked Sinner to take off the Whoop bracelet, the advanced device to monitor performance data

·Italy
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Corriere Della Sera broke the news in Italy on Sunday, January 25, 2026.
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