Arizona Diamondbacks
Signed LHP Armando Almanza to a Minor League contract and assigned him to Double-A Tennessee.
Colorado Rockies
Announced that INF Alfredo Amezaga has been claimed off waivers by the Pittsburgh Pirates.
Pittsburgh Pirates
Optioned outfielder Chris Duffy to Triple-A Indianapolis. Claimed INF Alfredo Amezaga off waivers from the Colorado Rockies.
Seattle Mariners
Placed INF Scott Spiezio on the 15-day disabled list, retroactive to April 19, with a strained left oblique and recalled OF Shin-Soo Choo from Triple-A Tacoma; Signed RHP Albie Lopez to a minor league contract and assigned him to Triple-A Tacoma.
Tampa Bay Devil Rays
Purchased the contract of RHP John Webb from Triple-A Durham.
Texas Rangers
Recalled OF Laynce Nix from Triple-A Oklahoma and optioned INF Adrian Gonzalez to Oklahoma.
Washington Nationals
Placed RHP T.J. Tucker on the 15-day disabled list and moved OF Alex Escobar from the 15-day disabled list to the 60-day disabled list; Purchased the contract of RHP Hector Carrasco from Triple-A New Orleans.