Most catchers make the move to first base later in their career.
Catchers such as Johnny Bench, Mike Piazza and Yogi Berra all spent time as first baseman and outfielders when they got older.
It is somewhat surprising that Joe Mauer is making this move so early, being only 28 years old. He is having by far his worst ever year batting .229 and surprisingly low .282 on-base percentage. Previous career lows are .293 and .372 respectively. He also hasn't shown any power this year with no home runs and only 4 doubles.
While Mauer was never much of a power hitter he has been able to get at least nine HRs 5 of his six seasons in the big leagues. He also has steadily improved his doubles over the last few years, getting over 30 in the last three seasons, including a career high 43 last year.
He has only played in 27 games so far this year, but these stats are still should be troubling to Twins fans.
In today's division battle against the Chicago White Sox Mauer will take the field at first base. If this move becomes commonplace in the Twins lineup, it will leave open the spot for best catcher in MLB that Mauer has held for so long. There are still many talented players behind him, but which ones will step up their play now that they see the opening that was closed for so long.