Minnesota has lost five games in a row after starting the week as the AL Central leader. The Twins were without outfielder Torii Hunter, who dropped the appeal of his two-game suspension for an equipment-throwing rant and started serving the penalty.
The Rangers snapped a 3-all tie with a six-run fourth, including Moreland's three-run shot pulled an estimated 409 feet down the right-field line to chase Mike Pelfrey (5-3). Gallo greeted reliever J.R. Graham with a 461-foot drive into the upper deck in right.
The Twins were the only AL team Lewis (6-3) hadn't beaten as a Ranger. The 35-year-old in his 10th major league season had been 0-5 in 11 career appearances, seven of those starts. He retired the last 15 batters he faced, and didn't return after a one-hour, 19-minute rain delay in the seventh.