PHOENIX—Ketel Marte and Carson Kelly homered early off Clayton Kershaw, and the last-place Arizona Diamondbacks delayed the Los Angeles Dodgers from reaching 100 wins by beating them 7-2 on Saturday. The Dodgers (99-56) fell two games behind first-place San Francisco in the NL West with seven to play when the Giants beat Colorado. The second-place team will host the NL wild-card game on Oct. 6, likely against the St. Louis Cardinals, who have won a franchise-record 15 consecutive games. Zac Gallen (3-10) pitched one-run ball over six innings for Arizona. Gallen, who spent much of the season on the injured list and hadn’t won since Aug. 26 against Philadelphia, established the tone early, striking out six Dodgers in the first two innings. “It’s the first time in how long that it’s clicked? Wish it would have clicked sooner, but I just kept plugging away,” Gallen said. “For it to click …