Baseball in Puerto Rico
By the 1949-50 season, several new ballparks were built, each containing 6,000 or more seats. The largest new stadium was Ponce's Estadio Francisco Montaner with 9,718 seats. Montaner has the distinction of being the first stadium in Puerto Rico that installed an artificial surface field. The installation of lights, which allowed for night games, further boosted stadium attendances. The Stadium was named to honor Francisco "Paquito" Montaner, one of the greatest Puerto Rican pitchers of all times.
Baseball in Puerto Rico
After the Cuban Revolution, hotels and casinos in San Juan benefited from Havana’ economic decay. During this timeframe, Puerto Rico expanded its presence in the Caribbean, and a native team frequently played again a representation of St. Thomas and Saint Croix in February. Julio Navarro was drafted from one of these exhibitions, eventually becoming one of the league's dominant pitchers. 
In 1961-62, due to political tension between the U.S. and Cuba, the Caribbean Series planned for in Havana's "Estadio Latinoamericano" (Latin American Stadium) was cancelled. The event was replaced by the Interamerican Series, which San Juan attended with a roster that included pitcher Florentino Rivera.