Just one unearned run scored under Arrieta's watch. The righty allowed four hits on the night, striking out thrand walking none.
Teammates Dexter Fowler and Addison Russell notched RBI doubles in a three-run sixth that also included a run-scoring single off the bat of Junior Lake.
A's starter Drew Pomeranz, in the middle of a fierce rotation competition, struck out six in three innings in his second exhibition start, but he also proved inefficient with his pitches, needing 59 total -- with only 35 thrown for strikes.
The lefty retired six of his first seven batters before loading the bases in the third for Anthony Rizzo, whose grounder resulted in two errors on first baseman Matt Olson. The A's prospect bobbled the ball before throwing it away, allowing two runs to score, one unearned.
A's infield prospect Max Muncy collected three hits in the game, bringing home Craig Gentry with an RBI single in the first, doubling in the third and adding a two-run home run in the bottom of the eighth off Donn Roach.
Up next: The A's will start a Jesse on the mound in two different venues Saturday, as right-hander Jesse Chavez takes on the Giants at Hohokam Park and right-hander Jesse Hahn makes the start against the Cubs in Las Vegas. Both are looking to secure a spot in the A's rotation, and both are making their second start and third appearance of the spring. Chavez has allowed two earned runs on six hits in his four innings of work so far, and Hahn has given up three runs on six hits, also in four innings.
Jane Lee is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.