Raonic, seeded 11th, won 70 percent of the points on serve in a 6-4, 7-6 (7-3) victory over Alejandro Falla. He lost eight points in five first-set games serving and 13 in the second, when he sustained his lone break of the day.
Steve Darcis outlasted Andrey Golubev for a 4-6, 7-6 (7-2), 7-6 (7-5) win in a match that took more than 2 1/2 hours. Darcis only had one break in the match. Eduardo Schwank claimed a 2-6, 6-4, 6-0 decision over Ruben Ramirez Hidalgo in the only other match Monday that went three sets.
Sergiy Stakhovsky defeated Evgeny Donskoy 6-2, 6-3 and advanced to a second-round match against second-seeded Andy Murray. A 6-2, 6-4 victory by Filip Krajinovic over Inigo Cervantes was worth a second-round slot against David Ferrer, the No. 3 seed.
World No. 2 Rafael Nadal is the top seed for the event. He's won it six of the last seven years.