Former Swiss tennis star Marc Rosset thinks Belinda Bencic has the talent and potential to win a Grand Slam but adds it’s now just the matter of the 25-year-old going out and performing at a high level for two weeks. Bencic, a former world No.4, put up a great run at the Tokyo Olympics last year to win her first gold medal. Bencic couldn’t hide her happiness after winning the Olympics as multiple times she spoke about how big of a win it was. By winning the Tokyo Olympics, Bencic proved that she is capable of …