Brian Banks debuted on September 9, 1996, playing for the
Milwaukee Brewers at County Stadium; he played his final game on
September 28, 2003, playing for the Florida Marlins at Pro Player
Stadium.
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No, stadium is a common noun. It becomes a proper noun when it is part of a name or a title. Examples:
Common noun: The stadium opens a noon.
Common noun: The prices at the stadium have really gone up.
Proper noun: We have tickets to see a game at the Salt Lake Stadium.
Proper noun: Leslie Banks starred in the 1939 movie, The Arsenal Stadium Mystery.