Best Tweets: Fans react as Novak completes the 'Djokemon'

But what, you may ask, is the Djokemon exactly?

Well that's an excellent question and thankfully tennis journalist Ben Rothenberg is on hand to explain.

Effectively it is every Masters, World Tour Final and Grand Slam title.

Sunday's victory over Roger Federer at the Cincinnati Masters gave Djokovic his elusive ninth Masters title and thereby completed both that set and the wider collection.

It's been a long-time coming, Djokovic has lost in the final at Cincinnati five times, but he's finally done it.

And fans were delighted.