Novak Djokovic made a winning start at the ATP Finals as he chases a record-equalling sixth title that will see him return to world number one.
The Serb was imperious, beating Italian eighth seed Matteo Berrettini 6-2 6-1.
World number two Djokovic can overtake Rafael Nadal to become year-end number one this week in London but must reach the final to stand a chance.
Roger Federer plays Dominic Thiem in the same group later on Sunday at the season-ending championships.
The event at the O2 Arena features the top eight players of the year who are split into two groups.
The group stage is a round-robin format with the top two players progressing to the semi-finals with the final held next Sunday.
Nadal is in Group Andre Agassi but is an injury doubt for the tournament with a stomach muscle issue, although the Spaniard said on Friday he is confident of playing against Alexander Zverev in his opener on Monday.
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Source: Jive naija