Grand Slam champions Djokovic and Wawrinka highlight the night

ATP World Tour Finals favourite Novak Djokovic (odds-on at 4/7) and Stan Wawrinka (11/1) completely demolished their respective opponents, Marin Cilic and Tomas Berdych, in their opening Group A round-robin matches – both 6-1 6-1.

The Serb, who is the title holder, and Swiss now go head-to-head with each other in the evening session on day four of this tournament held at London’s O2 Arena, with Djokovic unsurprisingly 1/6 to defeat Wawrinka.

That is because the current world number one and Wimbledon winner has beaten the Australian Open champion in 15 of their 18 meetings, including in the semi-finals here in 2013 in two sets. Djokovic is again odds-on for victory by that scoreline once more, at 1/2.

Wawrinka, though, did manage to win their last encounter, which was at the Australian Open quarters, in an epic five-set battle. The Swiss number two is a 4/1 price for victory again, and 7/1 to do so 2-1.

Following Djokovic and Wawrinka’s triumphs on Monday, the Serb said: “Realistically speaking, maybe we both were favourites in our matches. But to win 6-1 6-1 in both is maybe something that people didn’t expect – and us too.”

Group A’s opening match losers Berdych and Cilic meet earlier in the day, with the latter odds-on favourite for victory at 8/13, seeing as he has won three of his last four head-to-heads against the Czech.

Their most recent encounter was at the US Open, where the Croatian, who went on to claim his maiden Grand Slam, beat Berdych in straight sets in the quarter-finals.

Cilic (33/1 for the ATP Finals title) has played Berdych twice in London before (Queen’s Club and Wimbledon), and is still yet to drop a set against him in the city. He is a 13/8 chance to win 2-0 here.

Berdych (66/1 tournament outsider), though, does lead their overall head-to-heads 5-4, so his odds of 5/4 for a victory are more enticing.