The 1973 National League Championship Series was played between the New York Mets and the Cincinnati Reds from October 6 to 10. New York won the series three games to two and advanced to the World Series, where they lost to the Oakland A's in what was the second of three straight world championships for Oakland. The Mets set a record for lowest win percentage by a pennant winner, finishing the regular season with an 82–79 record.
The 1973 NLCS was marked by a fight that broke out in the fifth inning of the third game, beginning with a tussle between Cincinnati's Pete Rose and New York's Bud Harrelson at second base. Players from both sides joined in a general melee that lasted for several minutes and set off rowdy fan behavior at Shea Stadium in New York. Photographs of the fight, autographed by Rose and Harrelson, are now available at a number of Internet sites.
This was the only NLCS between 1970 and 1980 not to feature either the Philadelphia Phillies or the Pittsburgh Pirates. In fact, from 1969 to 1980 The NL East champion was either the Mets, Phillies or Pirates.