Sinner and Alcaraz headline the ATP Finals with Novak Djokovic out

Jannik Sinner and Carlos Alcaraz are poised to add another entry into their rapidly developing rivalry when the ATP Finals open Sunday without any members of the Big Three for the first time in nearly a quarter century.

The top-ranked Sinner and No. 3 Alcaraz evenly split the year's Grand Slam titles between them with two apiece and it would be fitting if the pair meet again in Turin.

And since Alcaraz was overtaken by Alexander Zverev in the rankings this week, the Spaniard could be placed in the same round-robin group as Sinner.

The draw for the eight-man event is scheduled for later Thursday.

After the round-robin stage, the top two finishers in each group advance to the semifinals.

The other qualifiers are: Zverev, Daniil Medvedev, Taylor Fritz, Casper Ruud, Alex de Minaur and Andrey Rublev.

The big name missing is that of defending champion Novak Djokovic, who withdrew on Tuesday due to an unspecified injury.

23 years since Djokovic, Federer and Nadal missed the finalsNot since 2001 has the finals been held without at least one of Djokovic, Roger Federer or Rafael Nadal. This season also was the first since 2002 without at least one Grand Slam title for a member of that trio.

Djokovic has won the ATP Finals a record seven times. He beat Sinner for the title last year.

Federer, who announced his retirement in 2022, won the event six times after making his debut in 2002; Nadal, who is retiring after playing in the Davis Cup the week after finals, was the runner-up twice at the finals but never won it.

Sinner withdrew from last week's Paris Masters due to a virus and showed up early in Turin for training.

This is for me the main event of the end of the year, Sinner said.

A final decision in Sinner's doping case is still pendingAs an Italian, Sinner will be the main focus of attention in Turin.

It's the first time that Sinner will be playing at home since it was announced before his U.S. Open title that he had tested positive in two separate drug tests earlier in the year.

A decision to clear Sinner of wrongdoing was appealed by the World Anti-Doping Agency in September and the Switzerland-based Court of Arbitration for Sport is expected to make a final ruling on the case early next year.

Alcaraz has won all 3 of his official meetings with Sinner this yearSinner opened this year by winning the Australian Open to become the first Italian man to win a Grand Slam singles title in nearly a half-century since Adriano Panatta raised the French Open trophy in 1976.

Alcaraz then claimed the French Open and Wimbledon titles to raise his career total to four Grand Slams.

Sinner responded by winning the U.S. Open.

Alcaraz won all three official meetings with Sinner this year and holds a 6-4 advantage in their career head-to-head rivalry. Last month, Sinner beat Alcaraz in the Six Kings Slam exhibition in Saudi Arabia.

Zverev won in Paris last week and looks for a 3rd title at finalsThe only two players in the field to have won the finals are Zverev and Medvedev.

Zverev won in London in 2018 and in Turin in 2021; while Medvedev triumphed in 2020 the final year the event was held in London.

Zverev enters in solid form coming off a title at the Paris Masters.

Fritz is looking to add another big result after his maiden Grand Slam final at the U.S. Open; Ruud was a finalist in 2022; De Minaur is making his tournament debut; and Rublev is making his fifth straight appearance.

Biggest prize money on the men's tour: $4.8 millionIf a player wins all five of his matches en route to the trophy, he will earn $4.8 million the largest winner's prize on the men's tour.

That's significantly more than what Sinner and Alcaraz earned for their victories at the U.S. Open ($3.6 million) and Wimbledon (2.7 million pounds or $3.45 million) this year.