Top seed Alexander Zverev returned to tennis from a recent illness with a 6-3, 6-0 victory over Japan's Yoshihito Nishioka in the second round of the ATP tournament in Los Cabos, Mexico. Zverev, after a first-round bye, needed just an hour on Wednesday to reach the quarter-finals in his first match since losing to Daniil Medvedev in the Australian Open semi-finals from two sets up. The Olympic champion from Germany started to feel unwell at the Melbourne grand slam and then missed Germany's Davi