I'm backing Over 3.5 goals here, and it comes down to two teams that play open football and combine for serious shot volume. Mainz average 1.99 goals for and 1.91 against over their last ten Bundesliga matches. Bayern average 3.50 for and just 1.30 against. I see a mismatch in defensive solidity, but Mainz's willingness to attack and their recent losses—2:3 to Werder on 24 October, 1:4 to Elversberg on 30 October—show both sides find the net in their games. Bayern's last match, a 2:2 draw with Borussia Dortmund on 31 October, proves they can be drawn into high-scoring affairs.
I'm concerned about Bayern's absences. Dias, Musiala, Gnabry, and Saibarl are out, which narrows their attacking options. Mainz's defence has conceded four goals in one of their last two games, but Bayern's defensive record is stingy: they've allowed just 0.90 goals per match over ten Bundesliga outings. If Mainz stays quiet, Bayern alone may not breach 3.5. Still, the combined expected goals—3.98 for Mainz, 4.45 for Bayern—and both teams' habit of scoring in open play push me toward the over.
Form and H2H
Bayern are unbeaten in their last ten official matches across all competitions. I see a team that doesn't lose, though their recent 2:2 with Dortmund shows they're not invincible. Over ten Bundesliga away matches, Bayern have won six and drawn four with zero defeats. That's the kind of consistency I respect.
Mainz are struggling at home. I've watched them fail to win in nine of their last ten Bundesliga matches on their own pitch. They lost 0:2 at Bochum on 27 October, then 1:4 at home to Elversberg three days later. Manager Urs Fischer admitted his team repeated defensive errors and flagged psychological difficulties after the Elversberg loss. He promised improvement against Bayern, but I'm not banking on a Mainz win. What I do see is that Mainz scored in eight of their last ten official matches across all competitions, and they take more than 14.5 shots in eight of their last ten home Bundesliga games. They'll create chances.
Best bet
I'm taking Over 3.5 at 1.22 on 1xBet. I like this price because it reflects Bayern's attacking power and Mainz's openness in the final third. Bayern average 3.3 goals per match in the Bundesliga over ten games. Mainz, for all their defensive frailty, average nearly 2 goals scored. The combined xG across both teams' recent matches sits at 3.98 for Mainz and 4.45 for Bayern. I need 4 goals total, and I'm confident Bayern will supply at least 2 or 3 while Mainz chips in with 1 or 2. Bayern's absences matter, but not enough to drop them below that threshold against a team that concedes freely at home.
Odds to watch
Bayern's win is priced at 1.3 on 1xBet, and I expect them to take three points. Mainz's home win sits at 9.65, which tells you everything about their form. The draw is 7.01. I'd also monitor Both Teams Score at 1.47 (yes) versus 2.53 (no). Mainz have scored in most of their recent matches, and Bayern will almost certainly find the net, so BTTS yes appeals if you want a secondary play. Over 2.5 is 1.22 and Under 2.5 is 3.98, but I prefer the Over 3.5 line because Bayern's attacking average and Mainz's concession rate make four goals a realistic target.

