An intriguing pair of opening matches in the 2019 ATP Finals at the O2 in London saw world number one Novak Djokovic and Roger Federer both get off to the perfect start in their attempt to be champion.

With so much on the line, including a potential $2.8 million to the undefeated winner of the event, much has been made of the seeding, with Djokovic and Rafael Nadal separated in the Group draw, the two groups being titled after tennis legends Bjorn Bjorg and Andre Agassi.

While Nadal will have to wait to prove his doubters wrong by showing on the court how he is over his injury worries, Djokovic wasted no time at all laying down a marker for his Spanish rival to take note of.

Djokovic, who will overtake at the top of the Men’s Singles rankings by year end if Nadal were to fall short while the Serb reaches the final, was is no mood to wait around. He surged home 6-2, 6-1 against a shell-shocked Matteo Berrettini.