Oldest: McKechnie Field, home of the Pittsburgh Pirates; opened 1923, renovated 1992.
Newest: JetBlue Field, home of the Boston Red Sox; opens this year with its own “Green Monster” outfield wall.
Smallest: Osceola Stadium in Kissimmee, Fla. (home of the Houston Astros). Capacity: 5,300.
Biggest: Camelback Ranch in Glendale, Ariz. (home of the White Sox and Dodgers). Capacity: 13,500.