British number one Johanna Konta beats Lesia Tsurenko (Ukr) 7-6 (7-4) 6-1

Radwanska (Pol) beats Lucic-Baroni (Cro), 6-4 2-1 after opponent retires through injury

Wozniacki (Den) beats Stosur (Aus), 6-2 6-1

Kvitova (Cze) beats Babos (Hun), 6-4 7-6 (7-5)