Jannik Sinner made a strong return with a straight-sets win at the Qatar Open in Doha.
Playing his first match since his Australian Open semi-final loss to Novak Djokovic, the world number two beat Tomas Machac 6-1 6-4 in just over an hour. He will next face Alexei Popyrin in the last 16.
Elsewhere, sixth seed Jakub Mensik came from a set down to defeat Jan Choinski and also reach the next round.
