WTA Finals live: Latest tennis scores as Iga Swiatek battles Elena Rybakina and Amanda Anisimova and Madison Keys face elimination

Hsieh Su-Wei and Jelena Ostapenko have taken the opening set 6-3 against the top seeds Jasmine Paolini and Sara Errani, with Paolini looking a little out of sorts. The Italian duo could have advanced with a straight-sets win but must now come from behind.

Defending champion Coco Gauff made 17 double faults and committed 75 unforced errors across her defeat to Jessica Pegula.

Pegula beat the 21-year-old 6-3 6-7(4) 6-2 and it was to Gauff’s credit that she made the match close despite struggling with her serve and forehand.

“Coco’s a great champion, great competitor, good friend, so it’s always tough playing her… I just tried my best today to execute where I could,” Pegula said.

The top seeds Jasmine Paolini and Sara Errani can book their place in the semi-finals with a straight-sets victory over Hsieh Su-Wei and Jelena Ostapenko, having opened their tournament with a 6-3 6-3 win over Asia Muhammad and Demi Schuurs.

Su-Wei and Ostapenko were also victorious in their opening match, requiring a match tiebreak, so can only advance with a win if Veronika Kudermetova and Elise Mertens defeat Muhammad and Schuurs in the later match.

Aryna Sabalenka made it five wins in a row over Jasmine Paolini as the top seed made an impressive start to her WTA Finals campaign with a 6-3 6-1 victory on Sunday.

“Doesn’t matter the score, I always know I have to stay focused. If you give her an opportunity she will take control of the game,” Sabalenka said after the 500th match of her career, and 60th win of her season.

“I was focused, I was calm and it feels like everything was in control.”

Paolini is also playing in the doubles event in Riyadh, which means the Italian must play a match every day throughout the round-robin phase.

Elena Rybakina continued her winning streak to sweep Amanda Anisimova aside in her first match at the WTA Finals.

Rybakina was the last player to qualify for the Finals, which was helped by winning the Ningbo Open and reaching the semi-finals of the Tokyo Open before withdrawing from the event.

She has now won seven matches in a row after needing less than an hour to beat Anisimova 6-3 6-1.

Iga Swiatek required just 61 minutes to beat Madison Keys on Saturday, in what was the American’s first match since the US Open two months ago.

Swiatek won 6-1 6-2 and the World No 2 said afterwards that she was “in the zone” during the straight-sets win.

“Kind of [happy] with everything. Mostly my serve and overall focus,” Swiatek said.

“I was in the zone from the beginning to the end, and I really wanted to keep it that way.”

If Swiatek and Keys win: Swiatek advances as group winner, Anisimova eliminated

If Rybakina and Anisimova win: Rybakina advances as group winner, Keys eliminated

If Swiatek wins in straight sets and Anisimova wins in three sets: Swiatek advances in top-two, Keys remains alive

If Rybakina wins in straight sets and Keys wins in three sets: Rybakina advances in top-two, Anisimova remains alive

From 12:00pm GMT: (1) Sara Errani and Jasmine Paolini v (6) Hsieh Su-Wei and Jelena Ostapenko

Not before 2pm GMT: (2) Iga Swiatek v (6) Elena Rybakina

Followed by: (4) Amanda Anisimova v (7) Madison Keys

Followed by: (4) Veronika Kudermetova and Elise Mertens v (8) Asia Muhammad and Demi Schuurs

Iga Swiatek and Elena Rybakina will look to back up their opening wins at the WTA Finals on day three of the tournament in Riyadh.

Swiatek swept aside a rusty Madison Keys 6-1 6-2 while Rybakina took down Wimbledon and US Open finalist Amanda Anisimova on Saturday.

Swiatek has defeated Rybakina in all four of their meetings this season, after previously trailing their head-to-head 4-2 at the start of the year.

In the second all-American match of the week, the loser of the match between Anisimova and Keys could face an early elimination from the Finals.