Serena Williams continued her comeback at Indian Wells on Saturday, defeating 29th seed Kiki Bertens to set up a third-round match with sister Venus.
Williams triumphed 7-6(7-5), 7-5 to progress in her first tournament in 14 months following the birth of her child.
The 23-time grand slam champion was broken early on, but hit back to get things back on serve. Bertens then broke again and served for the first set at 5-4 but a titanic effort from Williams saw her fight back, and send it into a tie-break which she duly won on her third set point.
The second was equally hard fought, the duo trading two breaks each before Williams got a third crucial break at 5-5. She then served out for the match, but only after saving a further two break points.
.@SerenaWilliams breaks again and she's pumped!
— WTA (@WTA) March 11, 2018
She will now renew her rivalry with big sister Venus, who advanced to the third round after defeating Romania’s Sorona Cirstea 6-3, 6-4, earlier in the day.
Caroline Wozniacki sailed through the round three with a 6-4, 6-1 win over Spain’s Lara Arruabarrena.
The second seed and Australian Open champion will next face Aliaksandra Sasnovich of Belarus.
One of the surprises of the day came as US Open finalist Madison Keys crashed out to wild card Danielle Collins.
The 15th seed lost to her unheralded compatriot in straight sets 6-3, 7-6(7-1).
In other matches on Saturday, defending champion Elena Vesnina was made to work against American CiCi Bellis, losing the first set before coming back strongly to win 2-6, 6-1, 6-1.
Fourth seed Elina Svitolina of Ukraine beat Germany’s Mona Barthel 6-4, 6-3 while compatriot and No. 12 seed Julia Georges defeated Russia’s Natalia Vikhlyantseva 6-4, 6-1.
Carla Suarez Navarro (27) of Spain beat Taiwan’s Su-Wei Hsieh 6-4, 2-6, 6-3 while Australia’s Daria Gavrilova (26) dismissed Belgium’s Yanina Wickmayer 7-6 (3), 6-2.