Jack Draper believes he needs to improve his physicality to make his mark in the Grand Slams, after being knocked out by Alex de Minaur at Wimbledon.
Draper, 20, who took a set off Novak Djokovic on his debut last year, won the opening set against the No19 seed but his challenge faded in a 5-7, 7-6, 6-2, 6-3 loss.
