AMSTERDAM, May 21 (Reuters) - Heerenveen and Vitesse Arnhem secured narrow wins in the Dutch league playoff first leg's on Thursday as new Feyenoord coach Giovanni van Bronckhorst made a losing start as the club's manager.
Simon Thern scored a 83rd minute winner for hosts Heerenveen to defeat Feyenoord 1-0 while Vitesse Arnhem came from a goal down to win 2-1 at PEC Zwolle.
Maikel van der Werff's effort after 31 minutes had given PEC the halftime lead but Marko Vejinovic and Valeri Qazaishvili scored twice in a six minute spell after the break.