Minor Moves: Astros, Ryan Roberts, Doug Mathis

Here are Sunday's minor moves from around MLB:

• The Astros will sign first baseman Japhet Amador and outfielder Leonardo Heras from Diablos Rojos in the Mexican League, according to a team press release. The 26-year-old Amador, who is listed at 6'4" and 315 pounds, was hitting .368/.419/.693 with 36 home runs in 449 plate appearances. Heras, 23, was hitting .310/.398/.519. The amounts of their bonuses are unclear.
• Ryan Roberts has cleared waivers and has accepted the Rays' outright assignment to Triple-A Durham, tweets the Tampa Bay Times' Joe Smith. Roberts was designated for assignment Thursday after hitting .247/.295/.377 with five home runs in 173 plate appearances for Tampa Bay. 
• The Pirates have acquired right-hander Doug Mathis from the Marlins for a player to be named later or cash, tweets Michael Sanserino of the Pittsburgh Post-Gazette. Mathis, who has spent the entire season at Triple-A New Orleans, will be assigned to Triple-A Indianapolis. Mathis, who last appeared in a MLB game in 2010 with the Rangers, has posted a 3.85 ERA, 6.7 K/9, and 4.2 BB/9 over 114 2/3 innings with the Zephyrs covering 24 games (21 starts). 

Charlie Wilmoth contributed to this post.