Costello sparks Stanford offense in 41-31 win over Arizona

Arizona's Nathan Tilford, center, rushes against Stanford in the second half of an NCAA college football game Saturday, Oct. 26, 2019, in Stanford, Calif. (AP Photo/Ben Margot)

Stanford's Cameron Scarlett, center, is congratulated by quarterback K.J. Costello (3) after scoring a touchdown against Arizona during the first half of an NCAA college football game Saturday, Oct. 26, 2019, in Stanford, Calif. (AP Photo/Ben Margot)

Arizona's Jaxen Turner (21) breaks the tackle of Stanford's Andrew Pryts, left, in the first half of an NCAA college football game Saturday, Oct. 26, 2019, in Stanford, Calif. (AP Photo/Ben Margot)

Arizona quarterback Grant Gunnell passes against Stanford in the first half of an NCAA college football game Saturday, Oct. 26, 2019, in Stanford, Calif. (AP Photo/Ben Margot)

Stanford's Cameron Scarlett (22) breaks the tackle of Arizona's Christian Young for a touchdown during the first half of an NCAA college football game Saturday, Oct. 26, 2019, in Stanford, Calif. (AP Photo/Ben Margot)

Stanford's Colby Parkinson (84) can't hang on to the ball while being covered by Arizona's Scottie Young Jr., left, during the first half of an NCAA college football game Saturday, Oct. 26, 2019, in Stanford, Calif. (AP Photo/Ben Margot)

Arizona quarterback Khalil Tate passes against Stanford in the first half of an NCAA college football game Saturday, Oct. 26, 2019, in Stanford, Calif. (AP Photo/Ben Margot)

Stanford's Cameron Scarlett (22) breaks the tackle of Arizona's Christian Young for a touchdown during the first half of an NCAA college football game Saturday, Oct. 26, 2019, in Stanford, Calif. (AP Photo/Ben Margot)

Stanford's Nathaniel Peat, center, rushes against Arizona in the second half of an NCAA college football game Saturday, Oct. 26, 2019, in Stanford, Calif. (AP Photo/Ben Margot)

Stanford quarterback K.J. Costello, left, is pressured by Arizona's Tony Fields II (1) during the second half of an NCAA college football game Saturday, Oct. 26, 2019, in Stanford, Calif. (AP Photo/Ben Margot)

Stanford quarterback K.J. Costello passes against Arizona during the first half of an NCAA college football game Saturday, Oct. 26, 2019, in Stanford, Calif. (AP Photo/Ben Margot)

Stanford's Cameron Scarlett (22) rushed against Arizona during the first half of an NCAA college football game Saturday, Oct. 26, 2019, in Stanford, Calif. (AP Photo/Ben Margot)

Stanford's Stuart Head (18) tackles Arizona's Tayvian Cunningham in the first half of an NCAA college football game Saturday, Oct. 26, 2019, in Stanford, Calif. (AP Photo/Ben Margot)

Arizona's Tayvian Cunningham, center, is tackled by Stanford's Paulson Adebo (11) in the second half of an NCAA college football game Saturday, Oct. 26, 2019, in Stanford, Calif. (AP Photo/Ben Margot)

Arizona's Jalen Johnson, right, scores a touchdown against Stanford in the first half of an NCAA college football game Saturday, Oct. 26, 2019, in Stanford, Calif. (AP Photo/Ben Margot)

Arizona's Jalen Johnson, right, is congratulated by quarterback Grant Gunnell (17) and Donovan Laie (78) after scoring a touchdown against Stanford during the first half of an NCAA college football game Saturday, Oct. 26, 2019, in Stanford, Calif. (AP Photo/Ben Margot)

Arizona's Tayvian Cunningham, center, is tackled by Stanford's Stuart Head, left, and Malik Antoine, right, during the first half of an NCAA college football game Saturday, Oct. 26, 2019, in Stanford, Calif. (AP Photo/Ben Margot)