Felix Auger-Aliassime says 'it hurts too much' as he retires suddenly at Shanghai Masters

Felix Auger-Aliassime has been forced to retire in the middle of his fourth-round match at the Shanghai Masters after picking up a knee injury. The No. 4 seed was facing Casper Ruud when he suddenly pulled up on his left knee in the fourth game of the match, and got broken after leading 40-0. He called the physio and had heavy strapping applied, but it was of no real use. We'll be bringing you the very latest updates, pictures and video on this breaking news story. For the latest news and breaking news visit: /sport/football .