World number one Novak Djokovic continued his fine form with a straight-set win over Canadian Denis Shapovalov in the Shanghai Masters.
Serbia’s 16-time Grand Slam champion, who won the Japan Open last week without dropping a set, cruised to a 6-3 6-3 second-round victory.
Defending champion Djokovic, 32, will play American John Isner next.
Isner, 34, hit 19 aces and lost only six points on his first serve in a 7-5 6-3 win over France’s Lucas Pouille.
Greek sixth seed Stefanos Tsitsipas, 21, edged out Canadian 19-year-old Felix-Auger Aliassime in a match between two of the most exciting talents on the men’s tour.
Tsitsipas, who had never beaten his 19-year-old opponent, even on the junior circuit, had to be patient before securing a 7-6 (7-3) 7-6 (7-3) win.
Victory moved Tsitsipas closer to qualifying for the ATP Finals in London next month, while German fifth seed Alexander Zverev – another still hoping to qualify and have the chance to defend his title – also needed two tie-breaks to overcome French veteran Jeremy Chardy in a 7-6 (15-13) 7-6 (7-3) win.
Russian seventh seed Karen Khachanov, Spanish eighth seed Roberto Bautista Agut, Italian 11th seed Matteo Berrettini and Belgian 13th seed David Goffin progressed to boost their chances of reaching the season-ending finals.
Andy Murray showed more positive signs in his injury comeback as he pushed Italy’s Fabio Fognini close before going down in a tetchy three-set battle in the Shanghai Masters second round.
Britain’s Murray, 32, matched Fognini in a long opening set, overpowering him in the second to force a decider.
Another tight set saw an angry Murray tell the world number 12 to “shut up” and fail to serve out for victory.
Fognini kept cool to dominate a tie-break and win 7-6 (7-4) 2-6 7-6 (7-2).
Meanwhile, Swiss second seed Roger Federer eased past Spain’s Albert Ramos-Vinolas in his opening match.
Federer, 38, dominated the first set against the world number 46 before a tighter second saw the 20-time Grand Slam champion secure victory by claiming the final three points of a tie-break to win 6-2 7-6 (7-5).
Cameron Norrie’s chances of becoming the new British number one are over after losing 6-3 6-1 against US Open finalist Daniil Medvedev in his second-round match.
Dan Evans, 29, will climb above Kyle Edmund in the rankings next week and becoming Britain’s leading male player for the first time – confirmed after former world number one Murray lost his second-round match.
British pair Jamie Murray and Neal Skupski moved into the second round of the men’s doubles with a 6-3 6-4 win over China’s Xin Gao and Zhe Li