Pittsburgh’s Steel Curtain. Dallas’ Doomsday Defense. Chicago’s Monsters of the Midway. L.A.’s Fearsome Foursome. Make way for Colorado’s Purple Rally Killers. On a Sunday afternoon when elite defense was paramount, the Rockies delivered a 3-1 victory to complete a three-game sweep of the defending World Series champion Rangers at Coors Field. Colorado limited the Rangers to six runs over the series. “It was fantastic defense,” said Gold Glove center fielder Brenton Doyle, who dislodged a section of padding in the center-field wall with his grab-and-smash web gem in the fifth inning. “I was speechless out there on those infield plays today by ‘B-Rod’ and ‘Tovie,’ ” Doyle said, referring to plays by second baseman Brendan Rodgers and shortstop Ezequiel Tovar. “We are going to win a lot of games if we keep playing defense like that.” After the Rockies won their fourth in a row for their first win streak of the season, manager Bud Black was jazzed. “When plays like that are made, it so energizing and uplifting and awesome,” he said.