Washington's offensive acquisitions paid quick dividends. Quarterback Smith completed 21 of 30 passes for two touchdowns without an interception, and Peterson carried 26 times and scored a touchdown. He caught two passes for 70 yards and lost a fumble.
The result was fifth-year head coach Jay Gruden's first opening week win.
Washington, which ranked 31st in third-down conversions a year ago, succeeded on 6 of 13 Sunday while the Cardinals went 1 for 8.
Smith capped an 11-play, 80-yard drive when he found Thompson for a 13-yard catch-and-run touchdown on the first play of the second quarter.
Peterson scored from 1 yard out to finish a 73-yard drive with 4:10 left in the first half, and Washington wasn't done.
After the Cardinals went three-and-out, the Redskins took over on their 8-yard line, and Smith passed to Peterson for 18 yards to the Arizona 44 at the 2-minute warning. An unnecessary roughness penalty later gave Washington a first down on the 12, and three plays later, Smith hit tight end Jordan Reed for a 4-yard touchdown.
(This story has not been edited by Devdiscourse staff and is auto-generated from a syndicated feed.)