PHOENIX (AP) — The Diamondbacks did a little throwback to the 1980s on Monday night, swiping bags, bunting for singles and leaning on small ball to generate their offense. Couple that approach with a dominant pitching performance by Zac Gallen and Arizona is pretty tough. Gallen threw seven excellent innings, Ketel Marte had a crucial two-out, two-RBI single in the eighth and the Diamondbacks beat the Pittsburgh Pirates 3-0 in the opener of a four-game series. “That’s our style,” Diamondbacks third baseman Josh Rojas. “That’s the way we have to play to win games. I don’t think we’re going to outslug people, that’s not our game.