LANDOVER, Md. (AP) Sam Darnold threw a touchdown pass and Baker Mayfield was solid aside from a fumbled snap in the latest stage of the Carolina Panthers quarterback competition, a 23-21 preseason-opening victory Saturday at the Washington Commanders.

Mayfield started and completed four of seven passes for 45 yards. He scurried for 3 yards on one play and botched the exchange with center Pat Elflein just inside the red zone, contributing to the first drive stalling and ending with a field goal.

Darnold took over with Carolina in the red zone after a fumble by Washington's Antonio Gibson and completed a play-action fade pass under pressure to Rashard Higgins for an 8-yard TD. After coach Matt Rhule said he expected each QB to play one series and get six to eight snaps, Darnold went back for a second drive, threw incomplete on third down and finished 2 of 3 for 16 yards.