Cahill: 'A pleasure to work with Sinner, he will continue to improve' - Tennis.it. Australian coach: 'over time he will become stronger and smarter' Jannik Sinner won the Miami tournament which launched him to No.
2 in the world tennis rankings. Sinner at number 2, 'If they had told me in January, I wouldn't have believed it' - Sinner after winning the Australian Open in Melbourne in January. 'He is playing at a stellar level and he deserves everything that he gets it's happening' - Cahill.