TURIN: Alexander Zverev, who made a confident start to his ATP finals campaign, described Ben Shelton as one of the most aggressive players in the world after defeating the American youngster 6-3, 7-6(6) in the tournament opener.

Two-time ATP champion Zverev, who was competing for the first time since being affected by an ankle injury in a heavy semi-final loss to Jannik Sinner at the Paris Masters just eight days ago, appeared well rested and refreshed in a high-quality display against Shelton in Italy.

Even when facing two set points after Shelton found a resurgence to move 6/4 ahead in the second-set tie-break, the German kept his cool to move to 1-0 in Bjorn Borg Group..