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.
Inter secure Serie A title in heated win over Milan
Inter Milan won their 20th Serie A title on Monday after a 2-1 win at AC Milan gave Simone Inzaghi's side an unassailable lead in the standings.
Bellingham's strike hands Real comeback win over Barcelona
LaLiga leaders Real Madrid's pursuit of a record-extending 36th Spanish title gathered momentum after Jude Bellingham scored a goal in added time to secure a 3-2 comeback win over Barcelona on Sunday.
Kohli unhappy with umpire after new full toss review method rules him out
Virat Kohli was left fuming when a new method applied to the ball tracking technology ruled him out on a full toss delivery that he thought went above his waist in Sunday's loss at Kolkata Knight Riders.
Man Utd overcome Coventry in FA Cup semi-final classic
Manchester United survived one of the most astonishing FA Cup semi-final comebacks ever to beat second-tier Coventry City on penalties after a spellbinding clash ended 3-3 after extra time at Wembley Stadium on Sunday.
Rybakina strolls to Stuttgart title
Elena Rybakina had little trouble in seeing off Marta Kostyuk 6-2 6-2 to win the Stuttgart Open on Sunday, her third title this year.
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