The ATP rankings are more fluid than ever with the Serbian the only of the Big 3 now in the top 3.

Djokovic, who in February racked up 361 consecutive weeks at No. 1, now has his sights on a return to the top.

Although the Serbian has regained his form after a difficult start to the season, he still faces challenges.

At Wimbledon as he will lose another 2,000 points with the ATP and WTA stripping the tournament of points.

Wimbledon have banned Russian and Belarusian players from competing following the Ukraine invasion.

This will impact on Djokovic slipping further down the ATP rankings.

The Serb could fall to his lowest position since his elbow injury in 2018 where he dropped to 22nd.

In 2018, Nole's mixed form coincided with Marian Vajda's absence as coach. This year, they separated for good.

Djokovic's refusal to be vaccinated could see him excluded from the forthcoming US Open.

As was the case at the Australian Open, the US requires a full Covid vaccination programme to enter the country.

According to The Telegraph, the restriction is not expected to be lifted before the tournament starts in August.

Once again, Djokovic could be set to miss out on securing valuable points in the ATP rankings.

The Serb's vaccination stance may also see him miss the likes of the Masters 1,000 in Cincinnati and Canadian Open.

Even Djokovic's presence at November's ATP Finals in Turin, where the top eight meet could be in jeopardy.