New Delhi [India], June 16 (ANI): World No. 1 Jannik Sinner revealed the advice he received from the tennis great Roger Federer when he was a 17-year-old walking around the players’ on-site hotel at the Terra Wortmann Open in Halle, where he was competing as a wild card in qualifying. Suddenly he was blocked by Severin Luthi, the coach of then nine-time Halle champion Roger Federer. Sinner said Luthi asked him to play a warmup match with Federer so that the 20-time Grand Slam champion could prepare well for his match. “I remember Luthi stopping me on the on the stairs of the hotel and asking m…
