Piazza hit .275 with eight home runs and 44 RBIs in 83 games with the A's after signing a one-year deal with the team as a free agent in December 2006.
Other players with A's ties who were on the ballot included another catcher -- Jason Kendall, was named on two ballots. Kendall hit .271 in part of three seasons (2005-07) with the A's.
First baseman Mike Sweeney, on his first ballot, was named on three ballots. Sweeney spent 13 of his 16 years in the big leagues with the Royals but played for the A's in 2008 after signing a free-agent deal in February of that year.
As for McGwire, he spent 12 of his 16 big league seasons with the A's, hitting 363 of his 583 career home runs for Oakland.
McGwire broke into the big leagues in a big way in 1987, leading the American League with 49 home runs. For that, he was named the AL Rookie of the Year.
Corey Brock is a reporter for MLB.com. Keep track of @FollowThePadres on Twitter and listen to his podcast. This story was not subject to the approval of Major League Baseball or its clubs.