Nils Petersen's 58th-minute goal secured a 1-0 victory for Freiburg over Borussia Monchengladbach, who finished Friday's match with 10 men following Alassane Plea's dismissal, to dent the visitors' hopes of a top-four finish in this season's German Bundesliga. Monchengladbach remain fourth, level on 56 points with fifth-placed Bayer Leverkusen, who host league leaders Bayern Munich on Saturday.