"Bayer is the only team in the top 5 leagues in Europe that still does not know the taste of defeat!
Introduction :
* Summary of the latest match: Highlight the recent draw between Bayer Leverkusen and Borussia Dortmund, emphasizing its significance in continuing Bayer's unbeaten streak.
* Mention of the unbeaten streak: Elaborate on the 20-match unbeaten run across all tournaments.
Historical Context :
* Bayer Leverkusen's history in the Bundesliga: Discuss the team's past
