MLB Memorabilia Autographed Baseballs – Ruben Mateo played six seasons in Major League Baseball, playing for the Texas Rangers, Cincinnati Reds, Pittsburgh Pirates, and Kansas City Royals. He was signed as an undrafted free agent by the Rangers in 1994. Ruben Mateo has hand autographed this Official American League Baseball. Certificate of Authenticity. Signature is slightly faded as shown and ball is brown as shown and is sold AS IS – No returns..