Once upon a time in the higher echelons of Men's tennis, there was a Big Four.

Between Roger Federer, Andy Murray, Rafa Nadal and Novak Djokovic, they formed a formidable cartel of talent, monopolising the Grand Slams.

But it looks like Djokovic has reached a level where there is a Big One ... and then everyone else.

ESPN analyst Luke Jensen thinks that assessment is fair as he told Off The Ball tonight in the wake of the Serb's commanding win over Federer.

"I think this proves it once again. The way he won it almost made it look like Federer was almost way past his what he's even capable of. What we saw against Murray in the semis, Federer couldn't bring that game because Djokovic was so dominant," he said.

Djokovic and Serena Williams at the Wimbledon Champions Dinner at the Guildhall, London (Thomas Lovelock/AELTC / PA Wire/Press Association Images)

"But with Nadal, there are question marks all over the place. Federer, where's he going in the next year or so? Murray may be the only guy stopping this guy from 14 or 15 majors or beyond. There isn't anybody on the horizon that you're going to say 'here's our next guy' to push Djokovic." 

Jensen also reacted to Serena Williams' latest triumph at Wimbledon as she edges closer to breaking more records in the Women's game.