This has been signed in person during the 2015 World Series. He signed this with a blue ball point pen.
MLB suffers tragedy as Yordano Ventura and Andy Marte killed in car crashes, MLB
Royals turn to Yordano Ventura in Game 3 of World Series vs. Mets – New York Daily News
Undersized and loved, Yordano Ventura fought to prove himself - ESPN - Buster Olney Blog- ESPN
KC Royals: Yordano Ventura Harmed By Odd Pitching Motion
How the Kansas City Royals were built - ESPN
Q&A: Dayton Moore talks Royals' culture
2016 Season Preview: Everything you need to know about the Kansas City Royals - Royals Review
World Series Notes: Mets' deGrom fades in fifth inning of Game 2 loss to Royals – Orange County Register
Remembering Royals pitcher Yordano Ventura
Final: Angels' Wilson hit around in confrontational 9-2 loss to Royals – Orange County Register