Alexander Zverev followed up his upset of Novak Djokovic by becoming the first German man to win a singles gold medal in Olympic tennis with victory over Karen Khachanov.

Having ensured his countrywoman Steffi Graf remains the only tennis player to win the Golden Slam of all four major titles and Olympic gold in one year, having done so in 1988, Zverev has now joined her as a singles champion.

Zverev has been one of the pack of players trying - and so far failing - to break the dominance of Djokovic, Rafael Nadal and Roger Federer at the grand slams, but here he has been a cut above and he eased to a 6-3 6-1 victory over Khachanov, representing the Russian Olympic Committee.