Jason Giambi
Willie Randolph was the Yankees starting second baseman during the 1978 season.
Aaron Boone only played part of the 2003 season with the Yankees. He was the backup for Robin Ventura.
In 1910 the Yankees were named the Highlanders. Hal Chase was the New York Highlander first baseman for the 1910 season.
Scott Brosius. Brosius retired after the 2001 season and Ventura took over at third in 2002.
Mark Teixeira played first base for the Yankees in the 2009 season. Mark is still under contract with the team.
Don Mattingly started the 1990 season at first base for the Yankees. When he was injured during the summer, Kevin Maas took over at first base for him. Steve Balboni also started several games at first base during the season.
Tino Martinez played his last season in 2005 with the New York Yankees as a first baseman. Here are his career statistics: http://www.baseball-reference.com/m/martiti02.shtml
Christian Guzman. Also sent to the Twins for Knoblauch were pitchers Eric Milton and Danny Mota and outfielder/first baseman Brian Buchanan.
Through the 2011 season, Mark Teixeira has 314 career home runs in 9 Major League seasons.
It wasn't Lou Gehrig. Gehrig played his final game early in the 1939 season and was replaced by Babe Dahlgren who was the Yankees starting first baseman for the 1939 and 1940 seasons.
15 regular season walk offs, 2 in the post season. 1 was a Mark Teixeira home run in game 2 of the ALDS and the other was a Melky Cabrera hit in game 2 of the ALCS.
One can purchase season tickets for the New York Yankees via online booking at tickets providers or at the stadion of the New York Yankees before the season starts.