Colby Thomas

I met him at Lew Wolff Training Complex, the Athletics spring training facility in Mesa, Arizona in 2025.

Colby signed a 2024 Topps Pro Debut card #PD-79.

https://www.baseball-reference.com/players/t/thomaco03.shtml

Kyle McCann

I met him at Lew Wolff Training Complex, the Athletics spring training facility in Mesa, Arizona in 2025.

Kyle signed a 2024 Topps Update card #US37.

https://www.baseball-reference.com/players/m/mccanky01.shtml

Daniel Susac

I met him at Lew Wolff Training Complex, the Athletics spring training facility in Mesa, Arizona in 2025.

Daniel signed a 2024 Bowman Chrome Prospects card #BCP-42.

https://www.baseball-reference.com/players/s/susacda01.shtml

Ramon Laureano

I met him at BayCare Ballpark in Clearwater, Florida, in 2025 when the Baltimore Orioles came to play the Philadelphia Phillies in a spring training game. 

Ramon signed a 2019 Topps Stadium Club card #151.

https://www.baseball-reference.com/players/l/laurera01.shtml

Vimael Machin

I met him at BayCare Ballpark in Clearwater, Florida, in 2025 when the Baltimore Orioles came to play the Philadelphia Phillies in a spring training game. 

Vimael signed a 2021 Topps Heritage card #502.

https://www.baseball-reference.com/players/m/machivi01.shtml

Franklin Barreto

I met him at BayCare Ballpark in Clearwater, Florida, in 2025 when the Baltimore Orioles came to play the Philadelphia Phillies in a spring training game. 

Franklin signed a 2018 Topps Heritage card #332.

https://www.baseball-reference.com/players/b/barrefr02.shtml

Steve Karsay

I met him at Tropicana Field in St. Petersburg, Florida in 2024, when the Los Angeles Angels, whom he was the bullpen coach for, came to play the Tampa Bay Rays.

Steve signed a 1995 Topps card #569.

https://www.baseball-reference.com/players/k/karsast01.shtml

Michael Taylor

I met him at Paul Owens Training Facility at Carpenter Complex, the Philadelphia Phillies spring training facility in Clearwater, Florida in 2024.

Michael signed a 2012 Topps Allen & Ginter's card #261.

https://www.baseball-reference.com/players/t/taylomi01.shtml

William Simoneit

I met him at Paul Owens Training Facility at Carpenter Complex, the Philadelphia Phillies spring training facility in Clearwater, Florida in 2024.

William signed a 2022 Midland RockHounds Team Set card #30.

https://www.baseball-reference.com/register/player.fcgi?id=simone000wil

Jesus Luzardo

I met him at BayCare Ballpark in Clearwater, Florida in 2024, when the Miami Marlins came to play the Philadelphia Phillies in a spring training game.

Jesus signed a 2020 Bowman card #61.

https://www.baseball-reference.com/players/l/luzarje01.shtml

Jarrod Parker

I met him at Paul Owens Training Facility at Carpenter Complex, the Philadelphia Phillies spring training facility in Clearwater, Florida in 2024.

Jarrod signed a 2014 Topps Allen & Ginter's card #268.

https://www.baseball-reference.com/players/p/parkeja02.shtml

Cal Stevenson

I met him at Paul Owens Training Facility at Carpenter Complex, the Philadelphia Phillies spring training facility in Clearwater, Florida in 2024.

Cal signed a 2023 Topps Heritage card #176.

https://www.baseball-reference.com/players/s/steveca01.shtml

Ryan Webb

I met him at the Tampa Bay Rays Fan Fest at Tropicana Field in St. Petersburg, Florida on February 18, 2023.

I met his father, Hank in 1995.

Ryan signed a 2005 Topps gold parallel card #671 (0129/2005).

https://www.baseball-reference.com/players/w/webbry01.shtml

Mark McGwire

I met him at the Perfect Game National Showcase at Tropicana Field in St. Petersburg, Florida in 2021. He was there watching his son, Mason.

Mark signed the cover of the August 1992 issue of Beckett Baseball Card Monthly.

https://www.baseball-reference.com/players/m/mcgwima01.shtml

Scott Miller

In March of 2021, I decided to seek out an address for Scott Miller. I found an address and sent him my card and a letter.

52 days later my card came back signed.

Scott signed a 1992 Front Row Draft Picks card #47.

https://www.baseball-reference.com/register/player.fcgi?id=miller006sco

Willie Adams

In March of 2021, I decided to seek out an address for Willie Adams. I sent him my card and the following letter.

24 days later my card came back signed.

Willie signed a 1993 Classic Four Sport Draft Picks card #272.

https://www.baseball-reference.com/players/a/adamswi02.shtml

Mike Grimes

In March of 2021, I decided to seek out an address for Mike Grimes. I sent him my card and the following letter.

32 days later my card came back signed.

Mike signed a 1992 Classic Best card #36.

https://www.baseball-reference.com/register/player.fcgi?id=grimes001mic

Mike Neill

In January of 2021, I decided to seek out an address for Mike Neill. I sent him my card and the following letter.

60 days later my card came back signed.

Mike signed a 1992 Upper Deck Minor League card #273.

https://www.baseball-reference.com/players/n/neillmi01.shtml

Tim Smith

In March of 2021, I decided to seek out an address for Tim Smith. I found an address and sent him my card and a letter.

Nine days later my card came back signed.

Tim signed a 1992 Stadium Club Dome card #176.

https://www.baseball-reference.com/register/player.fcgi?id=smith-001tim

Jim Waggoner

On September 10, 2020, I decided to go through these 2 alphabetical boxes of baseball cards and pull random cards out. I would then look to see if I could find a mailing address online to send a card to.

I ended up writing and mailing out 11 letters that day. All addresses that I looked up myself, not listed on an autograph database, as far as I could tell.

I found what looked to be a legitimate address for Mr. Waggoner, so I wrote him a letter and included my card.

36 days later my card came back signed.

Jim signed a 1991 Classic Best card #89.

https://www.baseball-reference.com/register/player.fcgi?id=waggon001jam