Borussia Dortmund cut Bayern Munich's lead at the top of the Bundesliga table to seven points after defeating Arminia Bielefled on Sunday evening.
Erling Haaland was back on the bench for Dortmund after his injury lay-off, as Donyell Malen continued to lead the attack for the hosts.
However, Marius Wolf's solitary strike in the 21st minute was enough to get the job done for Dortmund, who now sit seven points behind the defending champions.
Arminia, meanwhile, remain in 15th position, two points above the relegation zone.
Eintracht Frankfurt made it back-to-back wins after coming from behind to defeat Bochum on Sunday evening.
Sebastian Polter got the visitors in front with his eighth league goal of the season.
An own goal from Erhan Masovic shortly after the break got Frankfurt back on level terms, before Daichi Kamada scored what proved to be the winner in the 52nd minute.
FC Cologne kept their European hopes alive with a 1-0 win away to Bayer Leverkusen on Sunday afternoon.
Kingsley Schindler got the game's only goal for the visitors in the 67th minute, which was enough to get Cologne back on the wining trail in the Bundesliga.
Despite the defeat, Leverkusen remain in third spot but are now eight points behind second-place Dortmund while Cologne have moved up to seventh.
