Former world number three Elina Svitolina's first game back on the WTA Tour in more than 12 months ended in a near three-hour defeat to Yulia Putintseva in the Charleston Open first round on Monday.

Svitolina, 28, had been off the tour for a combination of injury and pregnancy, but was back in action for the first time since giving birth to her and male tennis player Gael Monfils' daughter Skai in October.

The Ukrainian, who reached both the Wimbledon and US Open semi-finals in 2019, won the first set after rallying back from 3-1 down in a tie-break

But the Kazakh world number 47 responded and prevailed 6-7 (3-7) 6-2 6-4 in two hours and 48 minutes, with Putintseva sapping her opponent's energy with frequent drop shots.

Former Australian Open champion Sofia Kenin was on track for victory in a topsy-turvy clash with Aliaksandra Sasnovich before rain intervened, forcing it to be re-scheduled for Tuesday with the American leading 6-1 6-7 (5-7) 3-0.

World number 50 Sloane Stephens fought back after an early scare to beat qualifier Louisa Chirico 3-6 6-1 6-2, while Alize Cornet breezed past Fiona Crawley 6-0 6-2.

Jil Teichman was one of three seeds to lose in the first round, going down 6-2 3-6 6-2 to 17-year-old Linda Fruhvirtova.

Ukrainian 11th seed Anhelina Kalinina lost 7-6 (8-6) 6-4 to Anna Kalinskaya, while 10th seed Zhang Shuai was beaten 6-4 1-6 6-3 by Julia Grabher.

Eugenie Bouchard returned for the first time since the 2023 Australian Open due to injury with a win over Ylena In-Albon 6-3 6-2 at the Copa Colsanitas in Bogota.

Third seed Nuria Parrizas Diaz was knocked out by Briton Francesca Jones, who is ranked 817th in the world, 7-6 (7-3) 6-1 in a major shock.