Kerber won just 10 points in losing the first set before finding her game for a 0-6, 6-1, 6-2 victory over Monica Niculescu. After winning 29 percent of the points in the first set, Kerber won 63 percent of the second and third sets.
She didn't managed a break chance in the first set but ended up converting four of her seven opportunities the rest of the way.
No. 3-seeded Ana Ivanovic handed a 6-3, 7-5 defeat to Francesca Schiavone in a second-round match. Ivanovic won more points (33-32) than Schiavone did when Schiavone served and finished with five breaks, including three in the second set. Ivanovic is 5-0 versus Schiavone.
Fourth-seeded Carla Suarez Navarro won two-thirds of the points on serve in a 6-1, 6-4 win over Elina Svitolina and No. 5-seeded Kirsten Flipkens had five breaks in a 6-2, 6-1 victory over Camila Giorgi. Suarez Navarro and Flipkens are paired against each other in the quarterfinals.
In addition to the Kerber-Niculescu result, the other first-round matches Wednesday saw Karin Knapp defeat eighth-seeded Daniela Hantuchova 6-2, 7-6 (8-6) and Alexandra Cadantu get by Melanie Klaffner 7-6 (7-4), 6-2.