The Athletics lost one of the best relievers in baseball, but acquiring the No. 3 overall prospect for a reliever is a home run.

The San Diego Padres and Athletics agreed to a blockbuster deal on Thursday, hours before Major League Baseball's July 31 trade deadline passed (6 p.m. ET). The Padres will add All-Star right-hander Mason Miller and veteran lefty JP Sears to their pitching staff in exchange for a package fronted by shortstop prospect Leo De Vries.

This article was originally published on www.si.com/mlb/padres as Padres Could Shift Mason Miller to Starting Pitcher. The San Diego Padres traded a massive prospect package to acquire relief pitcher Mason Miller, a true flame-throwing arm.