Swiss star Bencic, ranked 14th in the world, wasn't able to play. See more Toronto Sun on Google — save as a Preferred SourceThis advertisement has not loaded yet, but your article continues below. THIS CONTENT IS RESERVED FOR SUBSCRIBERS ONLYWorld number four Coco Gauff advanced to the semifinals of the WTA Toronto Masters by walkover on Tuesday after Belinda Bencic withdrew due to a hip injury, tournament officials announced. Swiss star Bencic, ranked 14th in the world at age 29, pulled out with the US Open set to start at the end of the month. Gauff, 6-2 all-time in WTA matches against Bencic, had beaten her this year in the fourth round at Wimbledon and the Miami quarterfinals.