FRANKFURT, Germany (AP) -- Mario Mandzukic scored both goals in Bayern Munich's 2-0 win over bottom-place Greuther Fuerth as the Bundesliga season resumed Saturday after its one-month winter break.
Bayer Leverkusen stayed nine points behind league leader Bayern by beating Eintracht Frankfurt 3-1 in a match that was interrupted when Eintracht supporters launched fireworks onto the pitch.
Wolfsburg gave new coach Dieter Hecking a winning start in a 2-0 victory over Stuttgart. Hoffenheim and Borussia Moenchengladbach played to a 0-0 draw and Mainz and Freiburg also ended in a goalless stalemate.
In the late match, defending champion Borussia Dortmund plays at Werder Bremen.
Mandzukic brought his season total to 11 goals by scoring in each half in Munich, his first brace for Bayern. Bayern did just enough to gain a routine victory over an opponent trying to limit the damage.
The Croatia striker scored the first in the 26th, connecting with a volley that was fumbled by goalkeeper Wolfgang Hesl. The cross came from Thomas Mueller.
Mandzukic doubled the lead in the 61st, heading in a corner from Toni Kroos.
"It was important to start with a win,'' Mandzukic said.
Bayern stunned the league earlier this week when it announced that former Barcelona coach Pep Guardiola would replace Jupp Heynckes at the start of the next season.
"I don't think that was a topic at all, the players didn't behave any differently,'' said Heynckes, whose contract runs out at the end of the season.
In Leverkusen, Germany coach Joachim Loew and German Football Federation (DFB) president Wolfgang Niersbach saw the match interrupted for about six minutes when Eintracht fans sent a couple of fireworks onto the pitch.
Referee Wolfgang Stark sent both teams to the changing room until the smoke cleared.
When they returned, Leverkusen overwhelmed Eintracht with two goals inside two minutes.
"We don't need such things in football. But we took advantage of the break because we had time to correct a few things that did not work well at the start,'' Leverkusens coach Sascha Lewandowski said.
Defender Sebastian Boenisch drove the ball inside the net in the 31st when Eintracht failed to clear a corner and the ball fell kindly in front of him. Less than two minutes later, Stefan Kiessling doubled the lead when he and Gonzalo Castro beat an offside trap to emerge alone in front of Frankfurt's goal.
Castro fed Kiessling, who easily notched his league-high 13th goal of the season. With Loew watching, Kiessling may have strengthened his case to be recalled to the national team.
Eintracht's problems in defense were exposed again when Kiessling fed Andre Schuerrle for Leverkusen's third goal in the 58th.
Alexander Meier cut the deficit in the 78th and Olivier Occean hit the post as Frankfurt stayed fourth despite the setback. Meier now has 12 goals, one behind Kiessling.
Wolfsburg's win was engineered by Brazilian midfielder Diego, who scored the first goal in the 51st, beating Stuttgart's goalkeeper Sven Ulreich with a well-placed shot inside the post from the edge of the area.
Alexander Madlung secured the win in the 78th by heading in a free-kick from Diego.
Hoffenheim failed to win under new coach Marco Kurz and remains stuck in 16th place.
In Mainz, the home team finished with 10 men after Shawn Parker was sent off late in the match.