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.
Juventus sack coach Tudor after eight-match winless run
Juventus have sacked head coach Igor Tudor after failing to win their last eight matches in all competitions, the Serie A club said on Monday.
India's Iyer taken to hospital after fielding injury
India batter Shreyas Iyer suffered a lacerated spleen and was admitted to hospital in Sydney after falling awkwardly while taking catch in the third one-day international against Australia, the country's cricket board (BCCI) said on Monday.
Norris unfazed by crowd boos after winning in Mexico
McLaren's Lando Norris shrugged off boos from the Mexican crowd on Sunday after the Briton seized back the Formula One championship lead from teammate Oscar Piastri at the Mexico City Grand Prix with a dominant win from pole position.
Mbappe and Bellingham strike as Real Madrid edge Barcelona 2-1 in fiery El Clasico
Goals from Kylian Mbappe and Jude Bellingham earned Real Madrid a 2-1 victory over Barcelona in a spiky El Clasico on Sunday that snapped a four-match losing streak against their rivals and extended their lead atop the LaLiga standings.
Brazilian teen Fonseca beats Fokina to win biggest career title in Basel
Brazilian teenager Joao Fonseca clinched the biggest title of his career on Sunday, storming past Spanish eighth seed Alejandro Davidovich Fokina 6-3 6-4 to win the Swiss Indoors Championships in Basel.
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