STANFORD (AP) — Stanford junior Keller Chryst will make his first collegiate start at quarterback at Arizona on Saturday, coach David Shaw said Tuesday.He’ll replace senior Ryan Burns, who went 4-3 (2-3 Pac-12) in his seven starts. Burns completed nearly 63 percent of his passes for 1,058 yards and five touchdowns. He’s also thrown seven interceptions.“I hate to get to this point,” Shaw said.