Li Na: Room for improvement
Top seed Li Na recovered from 4-2 down in the second set to defeat Chinese compatriot Zheng Jie 6-1 7-5 at Indian Wells on Saturday.
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The Australian Open champion is the leading player for the first time at a WTA Premier Mandatory tournament and was far from happy with her opening match.
She said: "At least I'm still in the tournament.
"If I see the result of course I'm happy, but I still feel I have so many things I can improve.''
Maria Sharapova has turned her focus back to tennis after carrying the Olympic torch into the stadium at the Winter Olympics in Sochi last month.
And there was no sign that the Russian has been distracted from her day job as she eased past German Julia Goerges 6-1 6-4.
Another of the top-five seeds was sent packing as Angelique Kerber followed Victoria Azarenka out of the door with a 2-6 7-6 (7/5) 6-4 loss to Maria-Teresa Flor.
It was a bad day for the Germans, with Wimbledon runner-up Sabine Lisicki also losing.
Eighth seed Petra Kvitova celebrated her 24th birthday with a 6-1 6-3 win over American wild card Coco Vandeweghe while Australian Open runner-up Dominika Cibulkova beat Donna Vekic 6-3 6-2.
Ana Ivanovic survived a two-and-a-half-hour battle with Elina Svitolina, winning on a deciding tie-break.