Rotterdam [Netherlands], February 17 (ANI): Jannik Sinner extended his unbeaten run in the 2024 season as he advanced to the semifinals of ABN AMRO Open in Rotterdam after Milos Raonic was forced to retire from the pair’s quarter-final match due to a hip injury. Sinner led the battle by 7-6(4), 1-1 when the former World No. 3 Raonic called a halt to proceedings at Rotterdam Ahoy. The Australian Open winner Sinner saved two set points at 4-5 and 15/40 before winning the first set in a tiebreaker. “He is for sure one of the toughest opponents to play against. This is a very unusual challenge you…