Lewandowski scored both of his goals in the second half, his 100th and 101st Bundesliga goals of his career. Both came in the second half, giving him seven goals over a 101 minute stretch, Kingsley Coman and Arturo Vidal setting him up to deflate Mainz. Coman scored himself, getting on the end of a Douglas Costa service for his second goal in as many starts.
Mainz had a go at Bayern in the first half, pressing Bayern to try and nick an early goal. With Jerome Boateng resting before a the midweek Champions League fixture, David Alaba and Javi Martínez handled the pressure well, using their skill on the ball to pass Bayern out of trouble. Thiago Alcântara and Xabi Alonso had to play deep in order for Bayern to keep the ball in midfield, making chances in attack hard to come by.
Bayern had a big chance in the first half though, Coman bursting past Pierre Bengtsson before Pablo De Blasis took him down inside the 18-yard box for a penalty. Thomas Müller came up short on the penalty shot though, slipping at the final moment before sailing the ball over the crossbar.
The second half opened up more as Mainz began to tire, though Yashinori Muto nearly found Danny Latza at the top of the box before Philipp Lahm made a crucial tackle. Lewandowski was able to find more space in Mainz's penalty area, and Coman hooked a cross just beyond Nico Bungert to find Lewandowski's head at the far post.
Lewandowski had another chance not long after, staying just onside before Vidal snuck a pass to him behind Mainz's defense. Mainz switched off wanting the offside call, and Lewandowski wiggled around the dive of Loris Karius to complete his brace.
Bayern still could not shift into neutral, Christian Clemens rattling the crossbar with a near-post strike. Douglas Costa took it upon himself to flash down the left flank, finally beating Daniel Brosinski before slicing in service to Coman. Douglas picked up his Bundesliga-best sixth assist, and Bayern saw out the match to collect their fourth clean sheet of the season.
Bayern extended their lead atop the Bundesliga table with their seventh victory of the season. They will return home in Bundesliga play next week as they aim for a six-pointer in the Klassiker against Borussia Dortmund. Mainz remain on nine points after picking up their second loss at home on the season.
Mainz 05 (0-3) Bayern Munich
FCB: Robert Lewandowski (51', 63'), Kingsley Coman (68')
Mainz XI: Karius – Brosinski, Bungert, Bell, Bengtsson – Clemens, Baumgartlinger, Latza, De Blasis – Malli – Muto
Bayern XI: Neuer – Lahm, Martínez, Alaba, Rafinha – Alonso, Thiago – Coman, Müller (Vidal 58'), Douglas – Lewandowski
- The consistency of this first half/second half dichotomy is encouraging, but it the stale starts to matches have to go away. Credit Mainz of course, who were not afraid to leave their own half to pursue the ball, but Bayern could start losing games if they do not start them well. Lewandowski was invisible at the top, isolated when Bayern had trouble keeping the ball in midfield. They not only need a more menacing plan of attack right out of the gate, but have to come out with more urgency to find the opener.
- Though incredibly raw, Coman is a very bright teenager with great ideas. His skill on the ball is not yet strong enough to emulate fellow frenchman Franck Ribéry, but his speed comes with enough wiggle to cause a lot of problems. Guardiola is not hiding the face he wants to give Coman minutes, which is another bad sign for a Mario Götze who wants to take advantage of his opportunities.
- Since Pep Guardiola said Alaba could be the best center back in the world, Alaba has looked very overwhelmed at times playing in the heart of defense. He looks better closing down the ball in space rather than recovering as a center back, and his presence in the middle makes Bayern's defense look more chaotic. One cannot blame Guardiola for using Alaba as a center back with so many players injured, but he is not a long-term solution there.
- Yashinori Muto deserves a lot of credit for his performance in the match, for he was the player who put Bayern under the most pressure. In previous matches this season, he has tried to run the attack by himself, but he combined well with his teammates on Saturday and used his skill to great affect. Mainz have profited from imported strikers, and Muto could be a player they could really profit from.