The goalkeeper protected his side from a bigger defeat after neutralizing the chances from Angelino and substitute Christopher Nkunku in the closing stages.
The host's efforts paid off with 17 minutes played as Mainz' Leandro Barreiro fouled onrushing Dani Olmo inside the area. Forsberg broke the deadlock with a well-placed shot from the spot into the bottom right corner.
The 23-year-old broke the deadlock in the 74th minute by thumping in a long-range effort after combining with Darlan Mendes.
After the goal, the Spanish team gained momentum and put pressure on Bayern, but the German side equalized in the 34th minute through Leon Goretzka's finish.
Everything changed after the break with Son latching onto another Kane through ball in the 47th minute to put his side ahead, before adding two more in the 64th and 74th minutes.
Ten minutes later, Giorgi Gabadze was sent off for a second yellow card. However, Granada didn't guarantee its win until injury time, when Molina scored following a cross from Antonio Puertas.
Instead of 2,100 fans, only a few hundred might go, while Sevilla is not expecting more than 500 followers.
Saturday ends with Southampton facing a tricky visit to play Burnley. Southampton have lost both league games so far and were dumped out of the Carabao Cup by Brentford, while Burnley lost their only league game away to Leicester City, before bouncing back to beat Milwall in the Carabao Cup. They have a good record against Southampton with four wins and three draws against them since October 2016.
The seven goals conceded in two games strengthened Leeds' need to fortify their defense. Enditem
In Mainz, Hungary captain Szalai is said to have raised the issue of deferred payments the players were promised when they waived their salaries during lockdown with the club's board on behalf of the team.
The 33-year-old, who netted 21 goals last season despite needing a knee operation, was filmed at Barca's training ground in tears on Wednesday and the move could be confirmed in a matter of hours. Enditem