Álex Grimaldo’s brilliant free kick was enough for Bayer Leverkusen to beat Mainz 1-0 and stretch its winning run across all competitions to 10 games. Mainz coach Bo Henriksen was sent off in stoppage time with his second yellow card for his vociferous complaints as his team pushed for an equalizer. The defending champion held on to move a point behind Bayern Munich, which hosts Hoffenheim on Wednesday to complete the first half of the season.