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.
Mercedes' Russell takes Azerbaijan GP pole
Mercedes' George Russell took pole position ahead of Ferrari's Charles Leclerc for the Azerbaijan Grand Prix on Friday.
Rayan's late equaliser rescues Brazil against Australia
Rayan struck deep into added time to spare Brazil's blushes as they drew 1-1 in the first of two friendlies with Australia on Friday, denying the hosts a first win over the five-time world champions in 25 years.
Gulf Giants Development win DP World ILT20 Development Tournament
Gulf Giants Development clinched the fourth DP World ILT20 Development Tournament after beating Desert Vipers Development by four wickets in the final at the ICC Academy in Dubai.
Sinner withdraws from China Open as knee injury recovery continues
World number one Jannik Sinner has withdrawn from the China Open, saying on Friday that he is not yet ready to compete as he continues to recover from the knee injury that also forced him to miss the US Open.
Alcaraz calls for end to late-night finishes at Grand Slams
Carlos Alcaraz has had enough of pulling all-nighters at Grand Slams, urging organisers to finish play by 11 pm after his US Open title defence came to an end in a gruelling 3:33 am finish earlier this month.
His Highness Sheikh Mohammed bin Rashid Al Maktoum, UAE Vice President, Prime Minister and Ruler of Dubai, received condolences from the Custodian of the Two Holy Mosques, King Salman bin Abdulaziz Al Saud, on the passing of Sheikh Ahmed bin Rashid Al Maktoum.
The UAE has strongly condemned recent attacks by the Tigray People's Liberation Front (TPLF) and allied armed groups against Ethiopian federal forces, as well as the seizure of airports in the Tigray region and the escalation of fighting in the neighbouring Afar and Amhara regions.
The UAE is launching a nationwide initiative to help families support children's learning, development and wellbeing during their most important early years.
