Naomi Osaka began the defence of her Pan Pacific Open crown with a quick win after opponent Daria Saville was forced to retire in just the second game.
Four-time grand slam champion Osaka won the opening game, before Saville was unable to continue due to a scary-looking injury to her left knee.
The former world number one will now face a second round match with world number 16 Beatriz Haddad Maia, who eased to a straight sets victory over Yuki Naito.
Karolina Pliskova secured her place in the next round in Tokyo with a 6-2 6-1 demolition of Isabella Shinikova, while Zhang Shuai will face second seed Caroline Garcia on Wednesday after overcoming Mai Hontama in two sets.
In Seoul, Jelena Ostapenko's hopes of repeating her 2017 heroics at the Korea Open are still alive after the number one seed narrowly beat 19-year-old Jeong Bo-young.
The world number 19 looked to be cruising after the opening set, but the unheralded South Korean hit back in the second and took it to a tie-break in the third, before Ostapenko's class showed as she won the crucial tie-break 7-2.
Elsewhere, 2021's beaten finalist Kristina Mladenovic saw off wildcard Park So-hyun 6-4 4-6 6-3, while second seed Ekaterina Alexandrova overcame a worrying second set to beat Asia Muhammad 6-1 3-6 6-1.
Wimbledon semi-finalist Tatjana Maria is also safely through to the second round after a tight 7-6 (7-5) 7-6 (7-5) triumph over Eugenie Bouchard.
WTA Finals: Gauff sees off Sabalenka to set up Zheng meeting in showpiece
Coco Gauff saw off world number one Aryna Sabalenka in straight sets and is now just one win away from taking the WTA Finals crown.
The American, who also beat Iga Swiatek on her run to the final, handed the Belarusian a second consecutive loss in Riyadh as she triumphed 7-6 (7-4) 6-3 in one hour and 49 minutes on Friday.
The pair traded blows in the opening set, with Sabalenka getting the first break in the third game, only for Gauff to follow her lead in the next.
The world number three forced the tie-break, and she had to hold her nerve to take the first set as Sabalenka had fought back from 6-1 down.
Gauff's momentum carried her into a 4-1 lead in the second set but that run was halted despite valiantly defending six break points in the next as Sabalenka attempted to start a comeback.
They traded more breaks, but Gauff had already done enough, avenging her defeats to Sabalenka in the Australian Open and Wuhan Open semi-finals to reach the championship match, where she will face Zheng Qinwen for the prize.
Data Debrief: Young guns pave the way
It has been an impressive WTA Finals for Gauff so far, and this victory means she has become the youngest player to defeat the world number one and number two at the tournament since Kim Clijsters in 2002 (Serena and Venus Williams).
She is also the youngest WTA Finals finalist since Caroline Wozniacki in 2010.
In fact, Gauff and Zheng will have the youngest combined age for the two finalists at the WTA Finals since Maria Sharapova and Serena Williams in 2004, at just 42 years and 271 days.
Sabalenka already knew she would be the year-end number one before entering these Finals, but she finishes the year on a slightly dour note, having lost consecutive matches for the first time since 2022 (against Donna Vekic in San Diego and Liudmila Samsonova in Guadalajara).
WTA Finals: Zheng edges Krejcikova to reach Riyadh showpiece
Zheng Qinwen was the first to book her place in the WTA Finals showpiece after downing Barbora Krejcikova in straight sets in Riyadh on Friday.
Zheng, who has dropped just one set throughout the entire tournament, needed an hour and 40 minutes to emerge a 6-3 7-5 victor against the Wimbledon champion.
The Olympic gold medallist wasted no time in stamping her authority on the contest, serving a love game straight away before breaking Krejcikova's serve soon after.
Zheng then missed two set points in the eighth game to take the early advantage, but remained composed, closing out the opener with another love game.
The world number seven threatened to run away with the contest after powering into a 3-0 lead in the second set, but Krejcikova responded emphatically.
She would go on to win the next four games, but made a fatal error when serving at 5-5, sending a forehand long which handed Zheng the opportunity to serve for the match.
After saving a break point, Zheng converted her second match point to book her place in the final, setting up a meeting with either Coco Gauff or Aryna Sabalenka.
Data Debrief: Age is just a number
With a win-loss record of 52-17 this year, Zheng became the first Chinese player in the Open Era to notch 50 WTA-level victories in a calendar year.
At 22 years and 31 days, she is also now the youngest player to reach the final in their maiden appearance at the WTA Finals since Petra Kvitova (2011).
Since the event's inauguration in 1972, she is only the second Asian player to reach the final at the WTA Finals after Li Na (2013).
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.
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