Thousands of Bayer Leverkusen fans invaded the pitch and cut up the turf and goal netting – despite potentially having a Europa League semi-final to come – as they celebrated the club’s first men’s Bundesliga title. The 5-0 thumping of Werder Bremen on Sunday brought about the title in style with five games to spare and the players were suddenly swamped by flag-waving fans on a packed pitch. The team struggled to get to the tunnel as the party went wild. The public address system played “Viva Espana” as a tribute to Spanish coach Xabi Alonso, who has masterminded a so far unbeaten season and c…