<P> The history of the Cincinnati Reds dates back to 1876, where they were originally called the "Red Stockings" and were the first true professional baseball team in the United States . The modern Cincinnati Reds began play in 1882 as members of the American Association, which Reds won in their first year of competition . The Reds joined Major League Baseball in 1890 and began their play in the National League . Over their history, the Reds have won 10 National League Pennants and made it to the post season 13 times, along with their five World Series Championships . </P> <P> Following the Cincinnati Reds second championship in 1940, the franchise only had one post-season appearance between 1941 and 1969 . During the 1970s, however, the Reds would appear in the post-season six times during the decade, along with four National League pennants, and back - to - back World Series championships in 1975 and 1976 . The Reds were nicknamed Big Red Machine during the time period and complied, what some have claimed to be, the best teams in major league baseball history . Following the 1976 championship and Big Red Machine era, the Reds struggled to sustain consistent post-season appearances . </P> <P> The fifth and most recent championship for the Cincinnati Reds came in 1990, in which that team went wire - to - wire and swept the World Series . The Reds have made only four post-season appearances since 1991, with their most recent appearance coming in 2013 . </P> <P> Overall, the Reds have compiled a winning percentage of . 508 over their history and also achieved a franchise mark of 10,000 wins on April 20, 2012, becoming just the sixth major league franchise to accomplish the feat . The Reds lost their 10,000 th game on August 28, 2015 . They were the fourth major league baseball franchise to reach this number . </P>

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