Novak Djokovic has made the ideal start in his quest to win a record-equalling sixth ATP Finals title.
The world number two easily beat Italy's Matteo Berrettini in straight sets at the O2 Arena in London.
However, things weren't as rosy for Roger Federer, who was beaten by Dominic Thiem in his tournament opener.
It's the second year in a row that the seven-time Dubai Duty Free Tennis Championships winner has lost his opening match at the ATP Finals.
Rybakina fights back to beat Osaka at Canadian Open
Second seed Elena Rybakina has fought back from a set and a break down to prevail 4-6 7-6(5) 6-4 in her Canadian Open quarter-final against Naomi Osaka in Toronto on Tuesday.
Egypt's Trezeguet joins Saudi side Al-Riyadh on free transfer
Egypt winger Mahmoud Hassan, better known by his nickname "Trezeguet", has joined Saudi Pro League club Al-Riyadh on a free transfer after terminating his contract with Egyptian side Al-Ahly last month, the club announced on Tuesday.
Shelton routs Mensik to reach Canadian Open semis
Ben Shelton has produced one of the standout performances of his career on Tuesday, overpowering Jakub Mensik 6-3 6-1 to reach the Canadian Open semi-finals as the American builds momentum ahead of the US Open.
Afghanistan seal 2027 World Cup berth, West Indies to go through qualifiers again
Afghanistan secured automatic qualification for the 2027 World Cup with a win over Ireland on Monday, leaving twice champions West Indies to go through qualifiers for the third successive edition of the 50-overs tournament.
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