Robson, playing Radwanska for the first time, piled up five breaks in a 6-3, 6-1 romp. She won two-thirds of the points on serve, even though she suffered a second-set break, and 53 percent off Radwanska's serve.
World No. 2 Maria Sharapova and third-seeded Victoria Azarenka posted first-round wins Monday. Sharapova got past Alexandra Dulgheru 7-5, 6-2, losing her serve once. Azarenka defeated Anastasia Pavlyuchenkova, who was coming off a tournament win Saturday in Portugal, 7-6 (10-8), 7-6 (7-3).
Also in the first round, Kristina Mladenovic rolled over Silvia Soler-Espinosa 6-1, 6-1 by saving eight break points; and Christina McHale outlasted Peng Shuai 7-5, 5-7, 6-1 in a 2 1/2-hour match.