Emil Ruusuvuori consigned Dan Evans to a first-round exit at the Qatar Open with a straight-sets victory on Tuesday.
Finn Ruusuvuori ousted the sixth seed with a 7-5 6-4 victory in Doha with a powerful display.
There were 26 winners from the racket of Ruusuvuori, who had only come out on top in one of his previous eight matches against top-30 opponents.
Ruusuvuori's next assignment will be a meeting with Jiri Lehecka, who saw off qualifier Damir Dzumhur 6-3 7-6 (7-3).
Roberto Bautista Agut, the fifth seed from Spain, saw the back of Marton Fucsovics 7-6 (9-7) 5-7 6-4.
Botic van de Zandschulp, Tallon Griekspoor and Soonwoo Kwon also made it through to round two.
Maxime Cressy had to dig deep to make it out of the first round of the Open 13, beating Geoffrey Blancaneaux 6-3 6-7 (5-7) 7-6 (7-4).
The fifth seed from the United States was joined in the last 16 by David Goffin, who defeated qualifier Lukas Klein 6-2 6-4.
Eighth seed Marc-Andrea Huesler made an early departure after going down in straight sets to Gregoire Barrere in Marseille.