Through the 2008 season, that is Lance Johnson with 21 triples in 1996.
John Olerud holds the record for highest batting average by a New York Met in a single season with .354 in 1998
Armando Benitez
Ed Kranepool joined the Mets toward the end of their first season, 1962. He remained with the Mets until he retired in 1979.
Armando Benitez holds the record for most saves in a singles season by a New York Met with 41, in 2001.
Carlos Beltran scored 127 runs in 2006. The rookie record is 74 by Cleon Jones in 1966
108
Carlos Beltran Holds the record for most home runs hit in a single season by a New York Met with 41, in 2006; matching the effort of Todd Hundley in 1996. For a CAREER in a Mets uniform, Darryl Strawberry holds the record with (I think) 251 homers.
Seriously the Mets blew the 2009 season and they end up with the record 70-92 they didn't even make the playoffs
The all time National League record for losses in a season was set in 1899 by the Cleveland Spiders whose record was 20-134. The modern day record was set in 1962 by the New York Mets at 40-120.
The 1986 Mets went 108-54 in the regular season, and 8-5 in the postseason.
The Mets have a 255-310-1 record versus the Dodgers in the regular season. They have a 3-4 record in the postseason. The Mets best season versus the Dodgers was 10-1 in 1988 and their worst was 2-16 in 1963 and 1962
In 2011, the New York Mets had a 77-85 record.