This is exactly what the Arizona Diamondbacks said they wanted six months ago when spring training started: September evenings that featured high-stakes baseball in the middle of a pennant race. Christian Walker and Lourdes Gurriel Jr. hit two-run homers, Zach Davies had a quality start and the Diamondbacks beat the Baltimore Orioles 4-2 on Friday night. “There's a buzz for sure,” Walker said.