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Gauff speaks briefly after her win:

Really happy with how I played today. Definitely a turnaround from the last match. This is the beauty of this tournament, you can lose a match but comeback and find a win.

I was just trying to play relaxed. I knew today was important to keep myself in the tournament

Definitely happiest with my serve. I thought I served smart, returns were good, happy overall. I don’t think Jasmine was 100% today so I send her my well wishes. It isn’t easy playing singles and doubles.

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Gauff beats Paolini 6-3, 6-2

Gauff nets an early backhand to give c the first point and finds the energy to hit a smashing forehand after moving Gauff into the corner. But from there the Italian falls away, mistiming two shots, and we’re at 30-30. Gauff then attempts a sliced drop shot that lands on her side of the net before Paolini hits a wild backhand into the crowd to make it deuce. Two netted shots from the Italian hands the American an impressive victory.

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Gauff 6-3, 5-2 Paolini* (* denotes server): Paolini has out of gas here, I think. She watches a Gauff forehand fly right by her and then hits a backhand so weakly the ball barely drops a foot in front of her. Gauff closes it out after the Italian nets. The world No 3 will now serve for the match.

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*Gauff 6-3, 4-2 Paolini (* denotes server): Paolini puts her arms out in frustration during a game as Gauff backs up the break with a very quick hold. She is in the driving seat with Paolini not having an answer for her backhands.

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Gauff 6-3, 3-2 Paolini* (* denotes server): Another game where Paolini starts strong and you can see she wants to push deep to force Gauff into a forehand error. At 30-30 though, she hits a strong serve but then a shot long takes it to deuce. Some brilliant defence from Gauff helps her take the next point as she slides to take on Paolini’s slice and wins it with a forehand. She then eases to a break, the first of this second set.

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*Gauff 6-3, 2-2 Paolini (* denotes server): We hit the hour mark as Gauff holds to love. Another fantastic service game and so, so much more conviction than her game against Pegula a couple days ago.

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Gauff 6-3, 1-2 Paolini* (* denotes server): All Gauff as she smashes a volley after moving closer to the net but Paolini takes a page from a book to hit a slice at the net to make it 30-30. The Italian then takes the lead after Gauff goes long and then holds.

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*Gauff 6-3, 1-1 Paolini (* denotes server): Paolini nets an early return before Gauff double faults. The Italian then hits a beautiful backhand volley lob that loops over the American and just on the line which produces a smile from her. Gauff does not let it deter her though and sees out a strong service game with a forehand winner.

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Gauff 6-3, 0-1 Paolini* (* denotes server): The net cord helps Paolini get her first point of the set on the board but there is no luck involved in her fantastic crosscourt backhand as she goes 30-0. Gauff responds with a backhand way out of Paolini’s reach but then nets the return to give the Italian the first game of the second set.

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Updated at 10.04 EST

We are back underway. Paolini to serve with huge pressure. She will be out if she loses this match in straight sets.

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Paolini has left the court to regroup as Gauff hits some serves even though the lights are off. She gives the empire a look before they come back on.

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Gauff takes the first set 6-3 against Paolini

Gauff wins the game to love in convincing matter after Paolini fades away to take the first set. A strong set from the defending champion and with 82% of her second serves won, it is clear that she has been working hard in Riyadh at her glaring weakness.

Coco Gauff takes the opening set in style. Photograph: Fatima Shbair/APShare

Updated at 10.08 EST

Gauff 5-3 Paolini* (* denotes server): With new balls, Gauff nets two forehands, the second one coming even after she had Paolini moving across the baseline. She nets it again to give the Italian a 40-0 lead and her face is in her hands. She gets back into after a Paolini shot is just out and then it’s her turn to net a backhand. Gauff then finds space to fire a backhand to make it 40-40 and the American earns the break after Paolini stumbles over Gauff’s crosscourt backhand.

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*Gauff 4-3 Paolini (* denotes server): Gauff hits two double faults in a row to give Paolini the game, after the Italian hit some strong backhands earlier. There was a certain inevitability about Gauff’s second double fault, you could see it in the body language. Let’s see how she bounces back.

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Updated at 09.46 EST

Gauff 4-2 Paolini* (* denotes server): Paolini needed that. She puts up her best service game and, with the help of some poor shot selection from Gauff, holds.

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*Gauff 4-1 Paolini (* denotes server): The serve is really working well for Gauff; she is keeping it simple. Her serve is a bit slower, taking a bit of stress away, but then using her speed to beat Paolini on the court. She breezes through the game to hold.

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Updated at 09.40 EST

Gauff 3-1 Paolini* (* denotes server): Gauff nets two backhands in a row as the Italian plays her first ball with a bit more power than in the first three games. But Guaff uses the court to make Paolini chase the ball at the baseline and gets to deuce after a weak second serve from the Italian. The two trade advantages for a while and at the fifth deuce, Gauff nets a backhand return. Paolini finally sees out the 8min 58sec game after Gauff sends one long.

Jasmine Paolini wins a mammoth game to get on the scoreboard in the opening set. Photograph: Stéphanie Lecocq/ReutersShare

Updated at 09.41 EST

*Gauff 3-0 Paolini (* denotes server): A long rally ends with the Italian powerfully slicing a winner and following it up with another crosscourt forehand that Gauff strains to reach. But she sends three returns long in back-to-back break points, putting her arms up in the air in frustration. Gauff gets the advantage and turns the game around to take the set after another poor return from Paolini, this one going into the stands.

For all the talk about Gauff’s second serve, she has won all seven points so far from it. Clearly the hard work she is putting on the practice courts is paying off.

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Gauff 2-0 Paolini* (* denotes server): Gauff begins with two strong forehand winners and wins break point after Paolini hits one long. Flying start for the defending champion.

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*Gauff 1-0 Paolini (* denotes server): The Italian goes 30-0 up with ease, her second point a cool crosscourt backhand but she follows it up with another that lands out. But Gauff comes back to hold and, notably, wins all three points from her second serve.

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Pictures and warm-ups complete … and play.

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Gauff and Paolini have just entered Centre Court at the King Saud University Indoor Arena. Tim Henman and Laura Robson are discussing Gauff’s serves struggles and Paolini’s ability to play today after feeling under the weather during her first match. The DJ behind them is distractingly playing an EDM beat as colourful lights flash all over. Ons Jabeur does the coin toss. Gauff wins and elects to serve first.

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Updated at 09.11 EST

The start of the first singles match will likely be delayed as the early doubles match has just finished. Taylor Townsend and Katerina Siniakova beat Erin Routliffe and Gabriela Dabrowski 6-6, 7-6 (3).

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Yesterday, players from the Serena Williams Group were in action as Elena Rybakina came from behind to stun Iga Swiatek, becoming the first player to book her spot in the semi-final. Amanda Anisimova also came back against Jessica Pegula and will battle it out for the second sem-final spot against Swiatek on Wednesday.

Elena Rybakina won her first two WTA Finals matches to book her spot in the sem-finals. Photograph: Stéphanie Lecocq/ReutersShare

Gauff has had an extremely successful start to her career, winning two slams on two different surfaces at the age of 21. But her serve – specifically her second serve – is holding her back. The world No 3 hit three double faults in a row against her compatriot Pegula in her first match and has spent the season battling against her form. Here is Tumaini Carayol’s verdict:

On the court, she possesses many assets. Her defensive skills and athleticism are peerless, her two-handed backhand is sublime and her intelligence on the court is complemented by a well-rounded game. While her forehand can be inconsistent, all evidence suggests that the quality of her second serve will probably determine just how far she can go in her career. Gauff leads the tour for success in return games, winning 46.8% of her return games this year, and she has won a respectable 68.6% of first‑serve points, which places her at No 12 in the top 50.

The problems begin with her second serve. Gauff is the sixth-worst performer in the top 50 for second‑serve points won this year. Excluding double faults, however, she has won the second‑highest proportion of second‑serve points on the tour. If she can lower her double‑fault count, her results will improve significantly.

Read the full analysis below, including how the hiring of the tennis biomechanics expert Gavin MacMillan has helped the American.

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Preamble

It is do or die for Coco Gauff, the defending champion, and Jasmine Paolini in the Stefanie Graf Group at the WTA Finals. Both players lost their first matches and need a win today if they want any chance of progressing to the semi-finals. The two last played each other in China during the semi-finals of the Wuhan Open. Gauff beat Paolini before winning the title, her third WTA 1000 singles title. But their head-to-head record is at an even 3-3 and before Wuhan, Paolini had won their last three matches, including at Cincinnati.

Later on Jessica Pegula and Aryna Sabalenka, who beat Gauff and Paolini respectively, will face off. Their head-to-head is more skewed in Sabalenka’s favour, the world No 1 winning eight of their 11 matches, including at the 2024 and 2025 US Open. But the American will take some solace in that she beat Sabalenka in Wuhan last month. Can she repeat the feat in Riyadh?

Gauff v Paolini is set for 2pm GMT/9am EST while Sabalenka v Pegula is slotted for 3.30pm GMT/10.30am EST. Join me for all the action and, as always, send me your thoughts, questions and predictions via email.

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