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.

In a startling move that sends the game’s most dominant reliever across the state and to another league, the Athletics have agreed to trade Mason Miller to the San Diego Padres, perhaps signaling a greater revamp to come at Petco Park, according to a person with knowledge of the deal.

The San Diego Padres acquired hard-throwing closer Mason Miller and left-hander JP Sears in a deal with the Athletics on Thursday, adding major upgrades to their pitching staff in a trade deadline blockbuster.