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.

One of the biggest trades in the past few years has gone down. On Thursday morning, the Athletics traded reliever Mason Miller and J.P. Sears to the San Diego Padres.