Bayern Munich stretched their unbeaten domestic run to 25 games as they booked their place in the quarter-finals of the German Cup with a thrilling win at FC Union Berlin.

An own goal from Union forward Ilyas Ansah and a Harry Kane header put them two goals up inside 24 minutes, but Leopold Querfeld halved the deficit from the penalty spot after Jonathan Tah was penalised for handball.

Diogo Leite headed into his own net too in first-half stoppage time to restore Bayern's two-goal cushion, before Querfeld again scored from the spot after Kane was adjudged to have fouled Leite while contesting an aerial ball.

Bayern - who have not been beaten in domestic games since March - looked vulnerable at set pieces in a 2-2 draw at Union in the Bundesliga last month, but it was the hosts who twice failed to deal with corners and Vincent Kompany's men took full advantage.

Kane headed in his 25th goal of the season in all competitions, a tally only matched by Real Madrid's Kylian Mbappe.

It was also the movement of the England captain at a Michael Olise free-kick that forced Leite to head past his own goalkeeper, but Kane gave the hosts a lifeline when he caught Leite with a raised arm.

The chaotic nature of the game suited Union, who put Bayern under pressure by dominating the second balls, but missed a handful of decent chances to equalise.

Luis Diaz thought he had put the game to bed with a clinical finish in the 75th minute, but mistimed his run, and the offside flag went up.

Bayern join 2023 winners Bayer Leverkusen and holders VfB Stuttgart in the last eight, after they defeated Borussia Dortmund and VfL Bochum, respectively.