Flyers–Penguins rivalry hot ticket in both cities; it is often the most anticipated match-up of the season. Flyers–Penguins rivalry The Flyers–Penguins rivalry, also known as the Battle of Pennsylvania, is a National Hockey League (NHL) rivalry between the Philadelphia Flyers and Pittsburgh Penguins ice hockey clubs. Both teams compete in the NHL's Eastern Conference Metropolitan Division. The rivalry began in 1967, when the teams were introduced into the NHL's "Next Six" expansion wave. The rivalry exists due to divisional alignment and geographic location, as both teams play in the Commonwealth of Pennsylvania. The Flyers and Penguins have met in the Stanley Cup
Baseball in the United States The city was also host to two other highly popular baseball teams in the National League, the Brooklyn Dodgers and the New York Giants, before their transfer to California beginning with the 1958 season. The Yankees' chief rivals, the Boston Red Sox, also enjoy a huge following in Boston and throughout New England. The fierce National League rivalry between the former Brooklyn Dodgers and New York Giants was transferred to the West Coast when the teams became the Los Angeles Dodgers and the San Francisco Giants, and California has always been among the US states which have supplied the most