(Cancún) World No.2 Iga Swiatek stalled at the start, but won her first match at the WTA Finals in Cancún (Mexico), Monday against Marketa Vondrousova, 7-6 (7/3), 6-0, before that N.3 Coco Gauff sweeps Ons Jabeur 6-0, 6-1.

This tournament which brings together the eight best players of the season has a particular challenge for the Pole, who can take back the throne of N.1 from Aryna Sabalenka depending on the progress of the competition.

This could have taken a bad turn from the start for Swiatek, broken from the start then led 2-5 in the first set.

But the 22-year-old set the record straight, subsequently leaving no chance to her Czech opponent, surprise winner of the last Wimbledon.

Vondrousova managed to force a tiebreaker in which she did not exist, giving the first set to Swiatek on a double fault.

Before completely collapsing in the second round and losing her serve three times in a row, leaving the Pole to conclude with her throw in at 5-0.

In the second match of the day, the defending champion of the United States Open Coco Gauff (N.3) swept Ons Jabeur (N.7).

The 19-year-old American won the first set 6-0 before being stopped by rain at 1-0 in the second, finally won 6-1 after an interruption of more than an hour.

The Masters table is divided into two groups of four. The top two in each group qualify for the semi-finals which start on Saturday.