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Minnesota Twins catcher-turned-first baseman Joe Mauer has some advice for Giants All-Star Buster Posey: play catcher as long as you can, and enjoy doing it.

Minnesota is making a rare visit to San Francisco this week for an interleague series that began Friday night, giving fans an even rarer opportunity to see two of the greatest hitting catchers of their generation play against each other, with one major twist: neither started at catcher in the opener.

Mauer moved to first base this year after a concussion last August ended his season. Posey is planning to catch for the Giants for the foreseeable future but has spent some time at first base the past couple years to rest his body during the season.