Tennis: Alexander Zverev to replace Jannik Sinner as ATP world number one after beating Tallon Girekspoor in Vienna

However, Cameron Norrie fell short of his best win of the season as world number five Daniil Medvedev saved a match point to win his round of 16 match. A frustrating year has seen Norrie drop to 41st in the world rankings and exit each of the last three Grand Slam tournaments in the first round. But the 31-year-old showed off his key attributes – tenacity, athleticism and controlled aggression – to threaten a major upset against Medvedev. Third seed Medvedev, fresh off victory Norrie served for the match at 5-3, 40-30, but Medvedev intercepted his opponent’s serve volley attempt and fought back to win 4-6, 6-3, 7-6 (7-1). Second seed Alcaraz also advanced with a 6-1, 7-6 (13-11) victory over Georgia. Nikoloz Basilashvili. Meanwhile, Novak Djokovic’s hopes of qualifying for the ATP Finals were dented by a second-round loss at the Swiss Indoors event in Basel. The 24-time Grand Slam champion, 39, lost 7-6 (7-4) 5-7 6-7 (5-7) to Germany’s Jan-Lennard Struff, who produced inspired tennis to beat the Serb for the first time in nine attempts.