Xabi Alonso made an excellent winning start as Bayern Leverkusen coach after a 4-0 home victory over Schalke in the Bundesliga on Saturday. Moussa Diaby blasted home his first of the season from 20 metres for 14th-placed Leverkusen and wing back Jeremie Frimpong then scored twice from Diaby passes. Paulinho added a fourth late on. Borussia Dortmund welcome champions Bayern Munich in Saturday’s late blockbuster. Among other early matches, mid-table RB Leipzig drew 1-1 at Mainz and bottom side Bochum beat Eintracht Frankfurt 3-0 for their first win of the season thanks to Philipp Hofmann, Evan N…