Previous pace-setters Leipzig failed to stay at the top despite coming from two goals down in their 2-2 home draw with 10-man Borussia Moenchengladbach.
Gladbach netted two first-half goals in quick succession as Alassane Plea and Jonas Hoffman exploited sloppy defending.
Leipzig striker Patrik Schick pulled a goal back on 50 minutes, poking the ball over the line after Gladbach goalkeeper Yann Sommer failed to hold a cross after stumbling over defender Denis Zakaria.
The game turned on the hour when Gladbach had Plea sent off for arguing with the ref after being booked.
Taking advantage, Leipzig attacked hard and Christopher Nkunku rescued a point when the French forward sprinted into the area and fired into the top corner on 89 minutes.