During the '60s, a gradual economic and social decay set in. A symptom of the city's waning competitiveness was the loss of both its longtime resident National League baseball teams to booming California; the Dodgers and the Giants both moved after the 1957 season. A sports void was partially filled with the formation of the Mets in 1962, who played their first two seasons at the Polo Grounds, the former home of the Giants, before moving to Shea Stadium in Queens in 1964.