Sijsling eliminated seventh-seeded Jarkko Nieminen 6-3, 7-6 (7-2) with an eight-ace attack helping his cause. He was good only about half of his first serves but won 29-of-31 of the points when he did land those serves.
Sijsling next goes against Robin Haase, who was a 6-2, 6-4 winner over Daniel Gimeno-Traver in his first-round match. Gimeno-Traver managed just one break-point chance and Haase saved it while finishing off three of his our break opportunities.
Sixth-seeded Feliciano Lopez completed first-day play with a 6-3, 6-3 decision over Laslo Djere. Lopez dropped only nine points over nine games serving to advance.