Manny Castillo

I met him at a Minor League game at Spectrum Field in Clearwater, Florida in 2017, when the Charlotte Stone Crabs, whom he was a coach for, came to play the Clearwater Threshers.

Manny signed a 1983 Topps card #258.

http://www.baseball-reference.com/players/c/castima01.shtml

Keith Hernandez

I met him at the visiting team's hotel in 2015, when the New York Mets, whom he was there as SNY's game analyst, came to play the Tampa Bay Rays.

Keith signed a 1983 Topps Traded card #43T.

http://www.baseball-reference.com/players/h/hernake01.shtml

Ron LeFlore

I met him at the Tampa Bay Rays Fan Fest at Tropicana Field in St. Petersburg, Florida on February 21, 2015.

Ron signed a 1983 Topps card #560.

http://www.baseball-reference.com/players/l/lefloro01.shtml

Tom Niedenfuer

I met him at the Tampa Bay Rays Fan Fest at Tropicana Field in St. Petersburg, Florida on February 21, 2015.

Tom signed a 1983 Topps card #477.

http://www.baseball-reference.com/players/n/niedeto01.shtml

Bill Nahorodny

I met him at the Tampa Bay Rays Fan Fest at Tropicana Field in St. Petersburg, Florida on February 21, 2015.

Bill signed a 1983 Topps card #616.

http://www.baseball-reference.com/players/n/nahorbi01.shtml

Roger LaFrancois

I met him at a Minor League game at Bright House Field in Clearwater, Florida in 2014, when the Palm Beach Cardinals, whom he was the hitting coach for, came to play the Clearwater Threshers.
I didn't have an extra card of him and actually broke my complete 1983 Topps set just to get his signature.

Roger signed a 1983 Topps card #344.

http://www.baseball-reference.com/players/l/lafraro01.shtml