New York Mets

In their 1962 inaugural season, the Mets posted a record of 40--120, the worst regular season record since MLB went to a 162-game schedule (two games were canceled). The team never finished better than second to last until the 1969 ''Miracle Mets'' beat the Baltimore Orioles in the 1969 World Series in what is considered one of the biggest upsets in World Series history. Since then, they have played in four additional World Series, including a dramatic run in 1973 that ended in a seven-game loss to the Oakland Athletics, a second championship in 1986 over the Boston Red Sox, a Subway Series loss against their cross-town rivals the New York Yankees in 2000, and a five-game loss to the Kansas City Royals in 2015.

Is this statement correct "did the mets ever win a world series"?
yes