Watch: Bayern Munich seizes control vs. RB Leipzig in battle for first place

The battle for Bundesliga supremacy heading into the league's winter break is proving to be quite one-sided, with Bayern Munich having an easy go of it against RB Leipzig at Allianz Arena.

The clubs entered Wednesday's match separated only by goal differential atop the Bundesliga table, but Bayern took a 2-0 lead within 25 minutes and then went up a man after Emil Forsberg was sent off, putting its challenger on the ropes early on.

Thiago opened the scoring as the beneficiary of a shot off the post by Robert Lewandowski. The Spanish midfielder was in the right place to redirect the rebound home off his thigh, giving Bayern a 1-0 lead in the 17th minute.

Another Spaniard, Xabi Alonso, made it 2-0 from close range eight minutes later off an assist from Thiago. The sequence began with a poor turnover in RB Leipzig's own half, and Bayern was clinical in making the promoted side pay for its mistake.

Bayern took its man advantage five minutes later, as Forsberg slid, cleats up, directly into Philipp Lahm's Achilles and seeing a straight red card for the challenge, which will extend his winter break beyond what was already set by the Bundesliga schedule.

Bayern's lead reached 3-0 just before halftime, after Douglas Costa was taken down at the edge of the box by Peter Gulacsi. Lewandowski converted from the penalty spot on the ensuing kick for his 12th league goal of the season.