Champions Bayern Munich returned to the top of the Bundesliga standings for the first time in two months with a 6-2 thrashing of Mainz on Saturday. Serge Gnabry, Jamal Musiala and Sadio Mane gave Bayern a 3-0 lead, Silvan Widmer pulled one back before half-time, before Leon Goretzka, teenager Mathys Tel and Eric Maxim Choupo-Moting wrapped up matters while Marcus Ingvartsen got Mainz’ second. Mane and Mainz forward Jonathan Burkardt failed to convert penalties given after video reviews but each side then scored seconds later, Mane himself on the rebound and Widmer after the ensuing corner kick…