Alex Rodriguez regrets giving Patrick Mahomes advice to play baseball over football ... but Joe Mauer once actually made that tough decision -- and he tells TMZ Sports he isn't ruing the choice one bit.
We caught up with the Minnesota Twins legend on Monday, just a day after A-Rod revealed he tried to get a 10-year-old Mahomes to quit the gridiron for the diamond -- and he made it clear, he's happy with how his life played out after he made the big pick.