The Rockies were a strike away from victory in Thursday’s matinee at Chase Field but folded instead when closer Pierce Johnson blew his first save of the year to send the Diamondbacks to a 5-4 walk-off win.
Rookie outfielder Corbin Carroll delivered the two-RBI single in the ninth off Johnson that gave Arizona its first four-game sweep over Colorado in 21 years and sunk the Rockies further into the basement of the National League West.
Arizona, meanwhile, moved into a tie with the Dodgers for first place in the division with the comeback victory that erased a strong outing from Colorado right-hander Connor Seabold and the would-be winning homer from rookie shortstop Ezequiel Tovar.