Jannik Sinner match disrupted as his opponent breaks unusual Wimbledon rule

There was an unusual moment during Jannik Sinner's quarter-final clash with Jan-Lennard Struff at Wimbledon

Jannik Sinner match disrupted as his opponent breaks unusual Wimbledon rule
There was an unusual moment during Jannik Sinner's quarter-final clash with Jan-Lennard Struff at Wimbledon