On Saturday, Bayern Munich saw their chances of becoming the first team in the Bundesliga to complete a season undefeated disappear.
The reason? A surprise 1-0 loss to Augsburg, courtesy of a 31st minute goal by Sascha Molders.
As a result, die Roten saw their unbeaten streak halted at 53 straight matches, with their last defeat coming back in October 2012 to Bayer Leverkusen.
Disappointment: Guardiola's men were on course to become the first undefeated German team
However, as impressive as their run was, the reigning Champions League winners are not the side with the longest unbeaten reign in Europe's biggest leagues.
That prize goes to Milan, who completed 58 straight games sans defeat from May 26, 1991 to March 21, 1993.
Invincibles: The Rossoneri still hold the longest unbeaten record in Europe's top leagues
And here are some of the other clubs in this special group:
Benfica, unbeaten in 56 games from October 24, 1976 to September 1, 1978
Porto, unbeaten in 55 games from February 28, 2010 to January 29, 2012. The Portuguese giants also went 52 games without defeat from January 29, 2012 to November 30, 2013.
Bayern Munich, unbeaten in 53 games from October 28, 2012 to April 05, 2014
Arsenal, unbeaten in 49 games from May 7, 2003 to October 24, 2004
Juventus, unbeaten in 49 games from May 15, 2011 to November 3, 2012
Fiorentina, unbeaten in 40 games from April 17, 1955 to June 3, 1956
Chelsea, unbeaten in 40 games from October 23, 2004 to November 6, 2005
Real Sociedad, unbeaten in 38 games from April 29, 1979 to May 4, 1980
Hamburg, unbeaten in 36 games from January 30, 1982 to January 29, 1983
Inter, unbeaten in 33 games from May 7, 2006 to April 18, 2007. The Nerazzurri also had another unbeaten run spanning 31 games from April 22, 2007 to March 2, 2008.
Barcelona, unbeaten in 31 games from September 11, 2010 to April 30, 2011
Dortmund, unbeaten in 31 games from September 18, 2011 to September 22, 2012
And the side with the longest unbeaten run in the world? That honour goes to Romanian outfit Steaua București, who went over 100 (some say 104, others 106) games without a loss spanning a time frame from August 17, 1986 to September 9, 1989.
