Nationals promote RHP de Los Santos from Double-A Harrisburg

WASHINGTON (AP) The Nationals have selected the contract of right-handed reliever Abel de Los Santos from Double-A Harrisburg and optioned right-hander Blake Treinen to Triple-A Syracuse.

Washington also moved left fielder Jayson Werth from the 15-day disabled list to the 60-day DL to make room for de Los Santos on the 40-man roster before Monday night's game against the New York Mets.

De Los Santos, 4-4 with a 2.65 ERA in 26 appearances at Harrisburg this season, was part of the trade that sent Ross Detwiler to the Texas Rangers.

Treinen is 2-2 with a 4.39 ERA in 32 relief appearances this season for the Nationals.

Nationals manager Matt Williams said the team will bring back right-hander Joe Ross from the minors to start Tuesday's game against the Mets.