Werder Bremen dealt Bayern its second straight loss Saturday, winning 3-0 and leaving the leaders with 66 points with five rounds to play.
Hamburg has 62 points while Bremen has 59.
Fourth-place Schalke's hopes of gaining one of the league's three Champions League berths was dealt a blow with a 1-1 draw against MSV Duisburg. The club fell six points behind Bremen.
Schalke sealed a berth in the UEFA Cup semifinals three days ago, but turned in a poor performance against Duisburg, leveling on Soren Larsen's 85th-minute goal.
PSV Eindhoven won its 19th league championship with a 1-1 draw against visiting FC Groningen.
PSV retained the title with two games left because its closest challenger, AZ Alkmaar, lost 1-0 at Ajax Amsterdam.
The champion has 80 points, 10 more than AZ and 13 more than Feyenoord.
Fourth-place FC Utrecht has 55, one more than 29-time champion Ajax. PSV's title confirmed it as one of the Netherlands' two entrants to next season's Champions League.
Erik Nevland had put Groningen ahead in the 41st minute after Timmy Simons' mistake gave him the chance to score from close range. Three minutes after halftime, Jefferson Farfan collected DaMarcus Beasley's pass on the edge of the area and shot past goalkeeper Bas Roorda from 10 yards.
The game was one of Guus Hiddink's last as PSV coach. Hiddink said last month he will leave, with media reports linking him to the national teams of Russia and England.
"It's a bit emotional. I will be leaving PSV but I am very pleased that we won again," Hiddink told reporters.
Beasley said he has no intention of going anywhere for now.
Meanwhile, AZ lost 1-0 to Ajax on Nourdin Boukhari's 33rd-minute goal. Roda JC drew 2-2 at Willem II, FC Twente beat visiting ADO The Hague 2-0, and Vitesse Arnhem beat FC Utrecht 1-0.
Kim Kallstrom scored two goals Sunday to help Rennes beat Sochaux 2-1 and record its eighth straight win.
Rennes, which started the season by conceding 16 goals in five games, is in third place with 56 points from 34 matches -- five behind second-place Bordeaux and an automatic berth into next season's Champions League.
Kallstrom scored the first goal in the fourth minute with a shot past goalkeeper Teddy Richert, but defender Souleymane Diawara leveled in the 20th after heading in a free kick from Jeremy Menez.
Kallstrom scored the winner from the penalty spot in the 81st minute after his shot on goal was handled by defender Jean Calve, who was sent off.
Calve appeared to have turned away from Kallstrom's powerful strike and the ball hit him below the shoulder.
Also Sunday, host Auxerre drew 0-0 with Le Mans. Visiting goalkeeper Yoann Pele making several outstanding saves.
The 23-year-old goalkeeper is being watched by several clubs, including English Premier League team Arsenal.
Lyon, with 75 points, leads Bordeaux by 14 points with only five matches remaining.
Lyon can clinch the title with a win at Paris Saint-Germain next Sunday.
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