Who has the biggest ballpark in 2009?

In 2009, the largest ballpark in Major League Baseball by seating capacity was the Michigan Stadium, which is not a baseball park but rather a football stadium. However, if referring to baseball-specific venues, the largest ballpark by outfield dimensions was the Polo Grounds, home of the New York Giants until 1957, but it was no longer in use in 2009. For current MLB stadiums, the largest by capacity at that time was the Los Angeles Angels' Angel Stadium, with a seating capacity of approximately 45,000.