Chargers wide receiver Simi Fehoko works out before a game against the Packers in November.

(Matt Ludtke / Associated Press)

After failing to score a touchdown in their first two preseason games, the Chargers utilized big plays against the Cowboys to finally break through.

The Chargers’ first touchdown came on a 70-yard end-around by wide receiver Derius Davis after a fake handoff.

“I just want to be a spark for this offense and get the momentum rolling,” Davis said. “Going out there first play and just do that was a great experience.”

Davis, the team’s primary returner, is trying to carve out a role in the offense. He made the Cowboys defense look lost on the scoring run, showcasing his speed.

“I didn’t think he was going to be able to make the turn, but he did,” Harbaugh said. “He did an incredible job working the sideline. Seeing his speed was great as well.”

Two possessions later, Easton Stick hit wide receiver Simi Fehoko with a perfectly thrown deep ball on a 78-yard touchdown reception.

Fehoko’s play also impressed his quarterback.

“The ability to not only catch it but also to score — it was really an incredible play by him,” Stick said. “He’s been doing that all camp.”

Fighting for a spot at the bottom of the receiver depth chart, Fehoko made a strong argument for staying on the 53-man roster. He has shined throughout the preseason, leading the team with seven receptions and 170 receiving yards.

Stick, battling Luis Perez to back up quarterback Justin Herbert, started the entire game. Stick improved on his other preseason outings, completing 12 of 29 passes for 187 yards and a touchdown. He also rushed for 17 yards.

“Reps are invaluable,” Stick said. “It’s a new experience [going against] a different style of defense than we have seen in practice over the last couple of weeks. It was a lot of fun to get a win.”

Still, there were moments of inconsistency. Stick made some errant throws and was picked off at the start of the third quarter.