More than 73,000 spectators will brave frigid conditions here Tuesday to watch the Buffalo Sabres and Pittsburgh Penguins stage the first National Hockey League game in a US outdoor venue. The "Winter Classic" follows the tradition of the 2003 "Heritage Classic" staged in Edmonton with the Oilers playing host to the Montreal Canadiens and will shatter the league one-game attendance record of 57,167 set at that game. Only 42,000 tickets were put up for public sale and those were all purchased in less than half an hour.