2018 Grand Slam Tennis: 4 things we have learnt 

#3 Djokovic is back!

Djokovic also won Wimbledon this year

When Novak Djokovic won in New York on Sunday night, this marked his troubles off the court from 12 months ago.

The Serb took six months out in an attempt to come back stronger.

An inspirational move after Roger Federer and Rafael Nadal took chunks out of their 2016 schedule before they would go on to win two majors each in 2017.

12 months later to the present, Djokovic will wrap up his 2018 campaign with two more majors added to his overall tally of 14 going level with Pete Sampras.

The 31-year-old also won the Cincinnati Masters last month over Federer to become the first player to complete the 'Golden Masters'.

The only major honor Djokovic is missing now from his trophy room is an Olympic gold medal.

Tokyo 2020 is two years from now and it may just be something hovering in the back of his mind.

Overall, Djokovic now has a very good chance of reclaiming the world number one spot before the ATP World Tour Finals is done and dusted in November in London.