The German hit five aces but lost his serve once in the second set on the only break point he faced.
Also, Jan Hajek of the Czech Republic downed Pere Riba of Spain 6-0, 6-2 and will next play second-seeded Marin Cilic, who has a bye in the opening round.
Italy's Andreas Seppi defeated Martin Fischer of Austria 6-3, 6-3 to set up a second-round match against either Anreas Haider-Maurer or the former top-ranked Thomas Muster, who makes his comeback on the ATP tour at age 43.
Wawrinka cruises into 2nd round in StockholmPalop commits to Sevilla
