Pashanski, Rehnquist advance at rain-delayed Swedish Open
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Massu, a Chilean who had to qualify to get into the main draw, was outplayed by the Serb from the start of the match.
"I practice quite a lot with Nico and he didn't play a very good match today," said Pashanski, who will next face defending champion David Ferrer of Spain.
Monfils made the semifinals of this year's French Open, taking a set off top-ranked Roger Federer.
Two other first-round matches were postponed due to rain.
Copyright 2008 by The Associated Press