Marco Reus gave them a 10th-minute lead in Mainz with Leroy Sane setting up Serge Gnabry for a second.

Leon Goretzka headed in, Ilkay Gundogan scored a penalty and Reus curled in a free-kick to make it 5-0 at half-time.

Gnabry and Timo Werner then scored before a late eighth from Gundogan's Manchester City team-mate Sane, who also had two goals disallowed.

Germany have won their opening three qualifiers, but remain three points behind Northern Ireland, who beat Belarus 1-0 to make it four wins from four.

They meet on Monday, 9 September in Belfast. Group rivals the Netherlands were not in action as they were playing in the Nations League finals.

It was a quiet international break for Germany keeper Manuel Neuer, who only had to make a total of three saves against Belarus, in a 2-0 win on Saturday, and Estonia to keep two clean sheets.

Joachim Low's side have won their last 14 World Cup and European Championship qualifiers since losing 1-0 to the Republic of Ireland in 2015.