Keys makes quick progress

Top seed Keys needed 84 minutes to dispatch compatriot Christina McHale 6-4 6-3 while second seed Jelena Jankovic was detained slightly longer as she beat another American, Irina Falconi, 7-6 (8/6) 6-3.

Third seed Sam Stosur beat Puerto Rican wild card Monica Puig 6-0 6-3 and fourth seed Alize Cornet delighted the home fans with a 6-3 6-3 success over Chinese qualifier Qiang Wang.

Fifth seed Zarina Diyas was the biggest casualty of the day as the Kazakh fell 7-5 4-6 6-1 to American Alison Riske. Other winners included Francesca Schiavone, Mirjana Lucic-Baroni and sixth-seeded American Coco Vandeweghe.