The Cinncinati Reds from 1970-76 aka "The Big Red Machine".
The Big Red Machine may have been the best baseball team ever fielded. From 1970, when they posted a regular season record of 102-60, until 1976 when they swept the Yankees in 4 games to win their 2nd straight World Series.
Over that span, the team won five National League Western Division titles, four National League pennants, and two World Series titles.
The team's combined record from 1970-1976 was 683 wins and 443 losses, an average of nearly 98 wins per season.
The Big Red Machine featured Pete Rose, Johnny Bench, Joe Morgan and Tony Pérez, and was supported by George Foster, César Gerónimo, Ken Griffey, Sr., and Dave Concepción.
The eight players most frequently referenced as members of the Big Red Machine include baseball's all-time hit leader in Rose; 3 Hall of Fame players in Bench, Peréz and Morgan; 6 National League MVP selections; 4 National League home run leading seasons; 3 NL Batting Champions; 25 Gold Glove winning seasons, and 63 collective All-Star Game appearances.
The starting lineup of Bench, Rose, Morgan, Pérez, Concepción, Foster, Griffey, and Gerónimo (collectively referred to as the "Great Eight") played 88 games together during the 1975 and 1976 seasons, losing only 19.
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PS. They are the only National League team during the last 85 years to win back-to-back World Championships. Before them, the 1921 and 1922 New York Giants are the last NL team to accomplish this feat.