Novak Djokovic step foot onto the courts of ATP Shanghai Masters in impeccable fashion as he was introduced as the Greatest of all time.

Novak Djokovic wasn't happy when the umpire slapped him with a warning at the Shanghai Masters. Facing Alex Michelsen in his opening match, the world No. 4 ran down the shot clock early in the second set and received a time violation.

Novak Djokovic notched his first victory since his shocking third-round exit at the U.S. Open, repeatedly having to battle back to ultimately defeat Alex Michelsen 7-6 (3), 7-6 (9) in their opening-round match at the Rolex Shanghai Masters in Shanghai,

Novak Djokovic has now won his last 33 ATP-level matches against American opponents, with his last such defeat coming against Sam Querrey at Wimbledon in 2016

Besides being tested by the NextGen American, Novak Djokovic also had to overcome emotions as the Serb had lost his cool after being slapped with a warning.