Grant Balfour

I met him at Tropicana Field in St. Petersburg, Florida in 2018. He was there to celebrate the 10 year anniversary of the 2008 American League Champion Tampa Bay Rays team.

Grant signed a 2010 Upper Deck card #490.

https://www.baseball-reference.com/players/b/balfogr01.shtml

Marcus Thames

I met him at a fantasy camp game at Paul Owens Training Facility at Carpenter Complex in Clearwater, Florida in 2016, when fantasy campers from the New York Yankees, whom he was an instructor for, came to play fantasy campers from the Philadelphia Phillies.

Marcus signed a 2010 Upper Deck card #194.

http://www.baseball-reference.com/players/t/thamema01.shtml