Happy Tuesday! As Elena Rybakina captures the WTA Finals crown in Riyadh, the ATP Finals begin group stage action in Turin.

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Elena Rybakina's WTA Finals victory provided a triumphant conclusion to an immensely challenging 2025 season. The 26-year-old endured coaching turmoil after hiring Goran Ivanišević, who quickly departed when she invited suspended coach Stefano Vukov to join them in Australia. Her on-court results reflected the instability, as she failed to reach a Grand Slam quarterfinal for the first time since her breakthrough season. Despite playing a full schedule and competing relentlessly, Rybakina struggled for consistency and needed a last-minute title run in Ningbo just to secure the final WTA Finals qualification spot as the sixth seed, arriving in Riyadh with minimal expectations.

In Riyadh, the Kazakh star produced an undefeated run through five matches against top-10 opponents, including a commanding 6-3, 7-6(0) victory over world number No. 1 Aryna Sabalenka in the final. She fired 13 aces and 36 winners while never facing a break point. The win earned Rybakina a record $5.235 million prize, the largest payout in women's tennis history, and marked her sixth career victory over Sabalenka. She ended the season having won eight of her last 12 matches against reigning world No. 1s, cementing her reputation as one of the tour's most dangerous giant-killers.

The ATP Finals kicked off in Turin with the season's top eight players competing for the year-end title. World No. 1 Jannik Sinner headlines the field alongside Carlos Alcaraz, Alexander Zverev, Taylor Fritz, Ben Shelton, and Alex de Minaur. Felix Auger-Aliassime secured the eighth seed after reaching the Paris Masters final, but Novak Djokovic's withdrawal due to a shoulder injury gave Lorenzo Musetti a late opportunity to make his ATP Finals debut as the alternate.

Sinner and Alcaraz enter as clear favorites to capture the prestigious title. The year-end No. 1 ranking remains at stake, with Alcaraz needing to reach the final or win all three group matches to secure the top spot. Sinner defends last year's title on home soil in Italy, riding a 26-match indoor hard-court winning streak. Their dominance this season suggests another Sinner-Alcaraz final showdown, though Taylor Fritz and Alexander Zverev lurk as dangerous semifinal threats.

Group stage action delivered as expected, with both favorites earning opening victories. Sinner defeated Auger-Aliassime in straight sets to begin his title defense, while Alcaraz overcame Alex de Minaur to start his pursuit of the year-end No. 1 ranking. Alexander Zverev handled Ben Shelton's ATP Finals debut with ease, and Taylor Fritz took down Musetti commandingly. The early results suggest the anticipated Sinner-Alcaraz showdown remains firmly on course as the tournament approaches the knockout rounds.

Novak Djokovic captured his 101st career title with a grueling three-set victory over Lorenzo Musetti in Athens. The nearly three-hour battle saw Djokovic rally from a set down to claim the trophy. Greece became the 20th country and Athens the 30th city where he has won a tournament, further cementing his global dominance.

Learner Tien earned his first ATP title at the Moselle Open, rallying from 5-1 down in the third-set tiebreak to defeat Cam Norrie 6-3, 3-6, 7-6(6). The 19-year-old became the first American teenager to win an ATP title since Andy Roddick in 2002 and will rise to a career-high No. 28 in the rankings.

Aryna Sabalenka will face Nick Kyrgios in a 'Battle of the Sexes' exhibition match on December 28 in Dubai. The world number No. 1 takes on the injury-plagued Australian at the Coca-Cola Arena. The event has divided fans between viewing it as light-hearted entertainment or potentially damaging to women's sport.

Veronika Kudermetova and Elise Mertens captured their second WTA Finals doubles title with a 7-6(4), 6-1 victory over Timea Babos and Luisa Stefani in Riyadh. The duo previously won the season-ending championship in 2022 and claimed Wimbledon earlier this year. They will split $1.067 million in prize money.

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