Gavrilova, the third seed, rallied to beat Brengle in three sets, 4-6, 6-3, 6-3, in two hours and 21 minutes.

Gavrilova won despite making 11 double faults compared to just three for Brengle. Gavrilova won 66% of her first serve points but had her serve broken five times.

The defending champion and seventh seed Tsurenko defeated Davis 6-4, 6-1 in 77 minutes.

On the men’s side of the joint WTA and ATP tournament, David Ferrer of Spain breezed past Russia’s Andrey Rublev 6-4, 6-3 in a night match to reach the second round.

The unseeded Ferrer won 78% of his first-serve points and broke Rublev’s serve four times in the 83-minute contest.

Ferrer next faces the winner of a match between sixth-seeded Juan Martin del Potro of Argentina and Mischa Zverev of Germany.

In another first-round match, Ryan Harrison edged fellow American John Isner 6-3, 7-6 (7/5).