Stefanos Tsitsipas survived an astonishing second-set fightback from Alexander Zverev to reach the Monte Carlo Masters quarter-finals with a 7-5, 7-6 (7-3) victory on Thursday alongside top seeds Novak Djokovic and Jannik Sinner. Former two-time tournament winner Tsitsipas was a set and 5-0 up, and held two match points in the sixth game when he suffered a major collapse. Olympic champion Zverev roared back to 5-5 before his comeback ended after 2 hours 6 minutes in the tie-break. “I would call it an adventure of a lifetime,” the ATP website quoted Tsitsipas as saying. “Something I am not face…