Desert Oasis' Herman Smith completed 10 of 15 passes for 179 yards and three TDs to help the ninth-ranked Diamondbacks (7-2, 7-1 Southwest) upend visiting Clark (3-6, 3-5) 51-18 on Thursday to secure the Southwest’s No. 2 seed.
Desert Oasis will host Centennial in the first round.
Smith’s touchdown strikes went to Richie Peterson (3 yards), Tyler Vazquez (49) and Marvin Duty (60). Trevon Barnes rushed for 102 yards, with TDs of 6 and 18.
Devin Fortenberry ran for a 2-yard TD and Andre Munyan had a 19-yarder. Matt Howard kicked six conversions and a 29-yard field goal.
Marquise McKinney ran 5 yards for Clark’s touchdown and Miguel Alejandro ran for the conversion.