New York traded for Swisher in November 2008 with plans of playing him at first, but when the club signed Teixeira a month later, Swisher moved to right field.
"That was our thought process, and then when we got Tex, it was a no-brainer to put Tex at first," said manager Joe Girardi.
Swisher's start on Saturday marked his eighth of the season at first base, his most since 2009, when he appeared at first 20 times, starting 10 games. He has 203 career starts at first base, 80 of which came with Oakland in '06. He made most of his starts in the outfield every other season and has played primarily right field for the Yankees.
But Girardi is never hesitant to put Swisher at first base when Teixeira needs a break.
"I think he's a very good first baseman," Girardi said. "I think he could be an everyday first baseman. I really believe that."