RasenBallsport Leipzig e.V. (lit. 'Lawn Ball Sports Leipzig'), commonly known as RB Leipzig or informally as Red Bull Leipzig, is a German professional football club based in Leipzig, Saxony. The club was founded in 2009 by the initiative of the company Red Bull GmbH, which purchased the playing rights of fifth-tier side SSV Markranstadt with the intent of advancing the new club to the top-flight Bundesliga within eight years. The men's professional football club is run by the spin-off organization RasenBallsport Leipzig GmbH. RB Leipzig plays its home matches at the Red Bull Arena.
In its inaugural season in 2009–10, RB Leipzig dominated the NOFV-Oberliga Sud (V) and was promoted as champions to the Regionalliga Nord (IV). RB Leipzig won the 2012–13 Regionalliga Nordost season without a single defeat and was promoted to the 3. Liga (III), then finished the 2013–14 3. Liga season as runners-up and was promoted to the 2. Bundesliga (II) as the first team since the introduction of the 3. Liga to win promotion after only one season.
On 12 May 2016, RB Leipzig ensured promotion to the Bundesliga for the 2016–17 season with a 2–0 win over Karlsruher SC. One year later, RB Leipzig captured a place in the 2017–18 UEFA Champions League by finishing as runners-up in the Bundesliga. On 18 August 2020, the club made history by participating in their first Champions League semi-finals, losing against Paris Saint-Germain of France.
The club nickname is Die Roten Bullen (English: The Red Bulls) due to the energy drink company Red Bull being the sole investor of the club.
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