At the warm-up tournament leading up to Wimbledon, the Giorgio Armani Tennis Classic, Novak defeated Frances Tiafoe 6-3, 3-6, 10-7.
It was the only match on grass for Nole ahead of the third Grand Slam event of the season.
The prestigious exhibition at the Hurlingham Tennis Club always attracts many tennis fans and also great tennis players.
This match was a good test for the 23-time Grand Slam champion.
The seven-time Wimbledon titlist won the first set 6-3, the American fought back to level the contest.
The 36-year-old Serbian star prevailed in the tie-break to seal the win.