Eintracht Frankfurt enter Sunday’s Bundesliga topper against Bayern Munich full of confidence and with the chance to go top of the table for the first time in 25 years. “This the biggest challenge in German football. We will definitely have to suffer. But we know what we are capable of,” coach Dino Toppmöller said after Thursday’s 3-1 Europa League win at Besiktas. “We are really looking forward to the match amid all the euphoria.” Frankfurt have won all four Bundesliga games since a matchday one defeat at Borussia Dortmund. If they also beat Bayern, who are one point ahead, they will be top o…