Iga Swiatek has moved a step closer to reclaiming the world number one spot with a straight-sets victory over Aryna Sabalenka in the WTA Finals.

Swiatek, the world number two, claimed her 67th win of the year and her 10th win in a row in the 6-3 6-2 victory against the current number one Sabalenka on Sunday in Mexico.

The match, which began on Saturday, was suspended after the fourth game due to wet weather which has featured consistently throughout the tournament.

When it resumed on Sunday, Swiatek broke Sabalenka in the first game back and went on to take the win in just over 90 minutes.

“I’m really, really happy, I think that was the toughest and nicest match that I have played here,” Swiatek said after the match.

The 22-year-old from Poland went unbroken throughout the match and won more than 75 per cent of her service points.

She will meet world number five Jessica Pegula in the final on Monday for a chance to finish the year as the world number one.

It only took an hour for Pegula to beat her doubles partner and fellow American Coco Gauff on Saturday in a 6-2 6-1 win to continue her exceptional tournament form.

Both Pegula and four-time grand slam winner Swiatek have gone through the tournament undefeated with neither player dropping a single set.

Jessica Pegula cruised past US Open winner Coco Gauff in straight sets to book a spot in the championship match of the WTA Finals in Cancun, Mexico.

The American doubles partners duked it out against each other on a wet and windy Saturday evening, with Pegula easily coming out on top 6-2 6-1.

It is still not known who will face the 29-year-old in the final, as the semi-final between world number one Aryna Sabalenka and world number two Iga Swiatek was pushed back as more heavy rains rolled in four games into their match.

The game was put on pause with Swiatek leading 2-1 and Sabalenka serving at 30-all.

The duo could be seen both wrapping themselves in towels to brace against the weather as organisers waited almost two hours for the game to resume.

Eventually, the game was suspended as bleak conditions prevailed.

Belarusian Sabalenka and Poland’s Swiatek will resume play on Sunday, with the final rescheduled to Monday.

World number two Iga Swiatek and world number three Coco Gauff have both secured their spots in the semi-finals of the WTA Finals in Cancun, Mexico.

Poland’s Swiatek confirmed her position with a 6-1 6-2 win over world number six Ons Jabeur.

Earlier, Gauff claimed a victory for US tennis fans in a battle of two of the major champions from this year.

She defeated Marketa Vondrousova 5-7 7-6 (4) 6-3 in the final round of group play on Friday night, ending the Czech player’s chances of advancing to the semi-finals.

The win was another feather in the cap for Gauff, making her the first teenager to make the final four of the year-end championships since Caroline Wozniacki in 2009.

She will now face Jessica Pegula while Swiatek takes on Aryna Sabalenka.

World number five Jessica Pegula defeated Greece’s Maria Sakkari in straight sets 6-3 6-2 in the WTA Finals, continuing her unbeaten run through the group stages.

Pegula had already secured her spot in Saturday’s semi-finals by beating both Sabalenka and Rybakina in her earlier matches in Mexico.

But the American is yet to drop a set so far this tournament and it took her just under 80 minutes to beat Sakkari, who failed to qualify for the semi-finals after losing all of her games.

Meanwhile, fighting for a spot in the semi-finals, world number one Aryna Sabalenka and world number four Elena Rybakina had their match suspended due to wet weather.

Sabalenka won the first set 6-2 in the Australian Open final rematch on a rain interrupted evening and had Rybakina on the ropes early in the second set.

But Rybakina fought back to take the lead 5-3 before the match was called off for the night, with play to resume on Friday.

Also on Friday, Iga Swiatek will take on Ons Jabeur while Coco Gauff plays Wimbledon champion Marketa Vondrousova to decide who makes the semi-finals.

Jessica Pegula produced an impressive display in the WTA Finals in Cancun, Mexico, as she beat world number one Aryna Sabalenka in straight sets.

Pegula broke her losing streak against the Belarusian having lost their last five meetings and the American has now won her last five games against top 10 players.

Sabalenka made 33 unforced errors, but it still took Pegula seven match points before clinching a 6-4 6-3 win and a place in the semi-finals.

After the match, Pegula said her improvement comes from feeling “more comfortable” playing top players this year.

Sabalenka will now play Elena Rybakina on Thursday night to determine the second qualifier from the group after Rybakina defeated Maria Sakkari 6-0 6-7 (4) 7-6 (2).

Rybakina started with a fury with a dominant first set but Sakkari fought her way back, winning the second set in a tiebreak.

Sakkari had two break point chances in the final set at 4-4, but Rybakina fought back and finished the tiebreak in a dominant fashion, skipping out to a 6-0 lead.

A number of players, including Sabalenka, Wimbledon champion Marketa Vondrousova and Iga Swiatek criticised the conditions of the courts in Cancun.

For the third year in a row, the host of the prestigious tournament – which features the top eight players of the season – was decided less than two months prior to the event.

World number two Iga Swiatek beat Wimbledon champion Marketa Vondrousova 7-6 6-0 in her opening match at the WTA Finals in Cancun.

Vondrousova, making her debut at the WTA Finals, took an early 2-0 lead in the opening set after breaking Swiatek in the first game.

Swiatek, though, soon wiped out that advantage after forcing home a break chance of her own to level at 2-2.

In humid conditions, both players were feeling the pressure on serve as another untidy background return from the baseline by the Pole allowed Vondrousova to immediately break again.

The Wimbledon champion maintained the pressure to break Swiatek in the seventh game, the Pole this time sending a return into the net.

Following the change of ends, Swiatek made the most of the new balls to prevent Vondrousova serving out the set and then produced a solid hold to reduce the deficit at 5-4.

Vondrousova’s early momentum had gone as Swiatek stepped up her offensive play to claim another break and level the opening set.

Swiatek, who can end the year by regaining the world number one spot, took the first set on a tie break and waltzed through the second in just over half an hour.

Monday’s other match saw US Open champion Coco Gauff need less than an hour to beat Ons Jabeur 6-0 6-1.

Gauff won the first seven games before an hour-long rain delay, Jabeur finally getting on the board after the restart before the American completed the win in 57 minutes

On Sunday, world number one Aryna Sabalenka opened the finals with a straightforward win over Maria Sakkari.

Sabalenka later took to social media to criticise the arrangements for players at the season-ending championships, with Cancun only announced as the host venue less than two months ago.

Swiatek added her criticism to the court – laid on top of a golf course – saying “it’s not comfortable” while Vondrousova described it as “very bad”.

Sabalenka faces Jessica Pegula, who also won her opening group match, on Tuesday night with Sakkari facing Elena Rybakina.