Walker Buehler starts Tuesday night's tilt against the D-backs and Matt Koch, who fills in for the injured Clay Buchholz. It's a long shot that Buehler finishes higher than third in NL Rookie of the Year Award voting, but he's already unofficially the No. 2 starter in the Dodgers' rotation. He's coming off one of his best starts, a career-high 12 strikeouts over six innings against the Rockies in L.A. Fans can watch the 6:40 p.m. PT matchup free on MLB.TV.