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• ATP Finals: Will Djokovic's drop out pave the way for another Sinner-Alcaraz tussle?

  The end of the 2024 season is upon us, but before the ATP Tour wraps up until 2025, there is one final big tournament to come.

  That season finale is, of course, the ATP Finals, and it kicks off in Turin on Sunday, with eight of the world's top players vying for the prize.

  Jannik Sinner is already sure of his place as the year-end number one, but there could be movement in the rankings below him, with Alexander Zverev heading into the tournament as the newly minted world number two, ahead of Carlos Alcaraz.

  Reigning champion Novak Djokovic withdrew on Monday, meaning for the first time since 2001, none of the "big three" (Djokovic, Rafael Nadal or Roger Federer) will feature at the ATP Finals.

  Djokovic beat Sinner last year to claim his seventh ATP Finals title, which is the most times a player has won the competition.

  Sinner, fresh from triumphs at Flushing Meadows and the Shangai Masters, heads to Turin as the favourite, with an eighth title on the line, but let's look ahead to the 2024 ATP Finals with Opta's pre-tournament facts.

  Sin(ner) City

  Sinner will not only be the firm fan favourite in Turin, he will always be the favourite to claim the crown.

  The 23-year-old has already collected a Tour-leading seven titles this season, including the Australian Open and the US Open, and will be out to go one better following his loss to Djokovic in last year's final.

  Six of Sinner's victories have come on hard court, with his triumph at the Halle Open the only exception. 

  The Italian is only the fifth player aged 23 or under to win at least six Tour-level titles on hard courts in a calendar year after Jimmy Connors (1973), Ivan Lendl (1981), Pete Sampras (1994) and Federer (2004).

  Since the ATP's redistribution of ranking points in 2009, only Djokovic (2015) and Nadal (2010) have clinched the year-end number one earlier in a season than Sinner in 2024.

  He is out to become the seventh player to win the ATP Finals on home soil in the Open Era, and will be the player to beat in Turin.

  Alcaraz and Zverev scrapping for second

  Zverev comes into the tournament in excellent form, on the back of winning the Paris Masters.

  His triumph in France not only saw him move into second place in the rankings, but also saw him claim his 66th match win, which is more than any other player in 2024 (Sinner is second on 65).

  Among the qualifiers for this year's event, Zverev (14) and Daniil Medvedev (11) are the only two to have recorded 10+ match wins at the ATP Finals.

  Zverev is only 27, but he is comparatively a veteran at the ATP Finals when stacked up against the other players to have qualified for this year's event. The German will be featuring at the tournament for the seventh time.

  Since the rankings were first published in 1973, Boris Becker (four) holds the most wins over the world number one at the ATP Finals – Federer and Zverev have the next-most such wins, with three each.

  Among players with multiple matches against the world number one at the ATP Finals, Zverev (3-2) is the only player to hold a winning record.

  With Djokovic out of the picture, Alcaraz will be hoping to get back into the top two to end the year.

  Only Sinner (12) has claimed more top 10 wins in 2024 than Alcaraz (11), whose last such win came against Sinner in Beijing in September.

  Alcaraz is the only player to claim multiple wins over top-five ranked opponents on hard, grass and clay courts in consecutive seasons since the rankings were published in 1973. John McEnroe (1984) is the only other player to achieve the feat in a single year.

  The other names in the hat

  Who else will be looking for glory next week?

  Medvedev comes into the ATP Finals ranked at number four in the world. Only two players won more matches at grand slams in 2024 than the Russian (18), and they are Sinner (23) and Alcaraz (19).

  Taylor Fritz reached his first major final earlier this year, losing to Sinner at the US Open. Only two players - Zverev and Sinner - have won more matches on the Tour in 2024 than the American, who has an impressive 49-21 record.

  After qualifying for the 2022 ATP Finals, Fritz will become the first American to make multiple appearances at the event since Andy Roddick (2003, 2004, 2006, 2008 and 2010).

  Casper Ruud is one of only three players, along with Sinner (eight) and Alcaraz (five), to have reached at least five ATP finals this year.

  Alex de Minaur, meanwhile, will become the first Australian to appear at the ATP Finals since Lleyton Hewitt 20 years ago.

  Hewitt went on to reach the final, so there is a good omen there for his compatriot.

• WTA Finals: Swiatek suffers shock exit despite Kasatkina victory

  Iga Swiatek suffered a shock exit at the WTA Finals despite her triumph over Daria Kasatkina in Riyadh on Thursday. 

  Swiatek swept aside Kasatkina 6-1 6-0, with the Russian a late replacement for Jessica Pegula who withdrew from the tournament due to a knee injury. 

  The Pole then had to rely on Coco Gauff beating Barbora Krejcikova to reach the final four, but the Wimbledon champion came through in straight sets to send Swiatek home. 

  Swiatek won 51 of 74 points and broke Kasatkina’s serve five of six times, ending the encounter in 51 minutes, which was her shortest match this year. 

  "It was a pretty solid game. It was a good performance," said Swiatek. "I was hitting the ball really well and picking the right shorts to play faster.

  But it mattered little in the end, with Swiatek revealing she was unaware of the scenario surrounding her progression to the semi-finals. 

  “Honestly, I don’t think it matters. Like we go out on court to win every match anyway. I was not thinking about that. I did not know that was the case," she added. 

  “I’m professional enough to always give 100 percent, no matter what the stakes are."

  Swiatek, though, became the third player in the 2000's to win 10 or more matches against top-10 opponents for three consecutive seasons, after Serena Williams (2012-2014) and Venus Williams (2000-2002). 

  But the day belonged to Krejcikova, who topped the Orange Group after extending her unbeaten run to two matches over Gauff. 

  The Czech emerged a 7-5 6-4 victor in just under two hours, saving 11 of the 12 break points she faced against the American to book her place in the semi-finals. 

  The world number 13 became the lowest-ranked player to make the semi-finals at the WTA Finals since Sandrine Testud (ranked 14th) in 2001.

  "I think the calmness that I have in myself is key. I was ready to enjoy and excited. I had nothing to lose," Krejcikova said. 

  "I mean obviously it was difficult. I was just more strict with my game and that was the key today.

  "It's very tough to say because before the tournament, I was dealing with some issues and didn't know what to expect.

  "I tried to stay positive and knew I was going to fight to the end.

  "I faced Zheng last year, she is playing great and had a great season and it is going to be really difficult but I have nothing to lose and I am just going to try and play my best tennis."

  Krejcikova will now face Zheng Qinwen, who came second in the Purple Group, while Gauff will take on world number one Aryna Sabalenka in the other match. 

• WTA Finals: Zheng powers past Paolini to join Sabalenka in last four

  Qinwen Zheng booked her place in the last four of the WTA Finals with a dominant 6-1 6-1 victory over Jasmine Paolini.

  The Olympic gold medallist hit 12 aces as she powered past this season's French Open and Wimbledon finalist in just over an hour in Riyadh.

  This was the winner-takes-all clash in Purple Group, with both players aiming to join world number one Aryna Sabalenka in the semi-finals.

  The form player since Wimbledon with 29 wins from 34 matches - also including titles in Palermo and Tokyo, plus a run to the final in Wuhan - Zheng quickly asserted her authority on proceedings.

  The 22-year-old scored five breaks of serve on the way to becoming the youngest semi-finalist on her WTA Finals debut since Petra Kvitova in 2011.

  "Finally, I showed off some tennis I really want to play," she said. "Of course, when you enter the match, you are nervous, but at the same time, you feel confidence because you know your level. And I know how capable I am.

  "I remember in 2022, my serve was quite strong. I don't know why but, suddenly in 2023, my serve started to drop. In this tournament and the rest of this half-year, it is the first time I've felt like the serve is starting to come back."

  Beating two top-10 players in the same tournament for the first time, Zheng is the first Chinese player to achieve the feat since Li Na (four) at this event 11 years ago.

  The seventh seed also follows in the footsteps of Na and Kimiko Date in 1994 as one of three players representing an Asian country to reach the last four at the WTA Finals. 

  Sabalenka's place in the semi-finals was already secured, rendering her 6-4 3-6 6-1 defeat by Elena Rybakina academic, though ending a seven-match winning streak.

  Having shared the two meetings this season in Brisbane and Madrid, the players took a close set each here, but it was one-way traffic in the decider.

  In the final match of her first tournament since withdrawing from the US Open with a back injury, Rybakina did not face a single break point in the final set, while winning all 12 points on her first serve, to bow out with victory.

  Though academic, it was an historic victory for the Kazahstani, who became the first player representing an Asian country to defeat the world number one at the WTA Finals.

  Rybakina is also the fourth player to achieve six or more wins over the WTA's number one across a two-season span, after Tracy Austin (1979-80), Venus Williams (1999-00) and Lindsay Davenport (2000-01).