 On January 25, 2019, Estrada signed a one-year contract with the Oakland Athletics.He was released on August 20.Estrada throws a four-seam fastball with an average velocity of 86-91 MPH, a curveball averaging 76-79 MPH and an 85-87 MPH cutter.His best pitch is his changeup, which he throws averaging 76-77 MPH with considerable downward movement.