Dak Prescott has won a two-man race with Dallas teammate Ezekiel Elliott to take the 2016 Associated Press NFL Offensive Rookie of the Year award.

The Cowboys' fourth-round draft pick stepped in when quarterback Tony Romo was injured in the preseason and led Dallas to a 13-3 record, best in the NFC. He got plenty of help from his running back, Elliott, the fourth overall selection.

In balloting announced Saturday night, Prescott received 28 1/2 votes from a nationwide panel of 50 media members who regularly cover the league. The other 21 1/2 went to Elliott, who rushed for a league-high 1,631 yards and scored 15 times. Prescott ranked third in passing behind the two Super Bowl quarterbacks, throwing for 23 TDs with four interceptions.

Prescott is the first Cowboy since Emmitt Smith in 1990 to earn the honour. Tony Dorsett, Duane Thomas and Calvin Hill also won it for Dallas.

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Chargers defensive end Joey Bosa has won the 2016 Associated Press NFL Defensive Player of the Year award in a landslide.

Sitting out the first four games after a protracted preseason holdout didn't damage the third overall draft pick much. He still managed 12 1/2 sacks as the key threat on a San Diego defence that ranked only 16th overall.

That performance earned Bosa 37 votes from a nationwide panel of 50 media members who regularly cover the league. He easily outdistanced Jacksonville Jaguars cornerback Jalen Ramsey, who received 10. The other three votes went to Falcons linebacker Deion Jones in balloting announced Saturday night.

Bosa, whose father played three seasons with Miami (1987-89), is the second Charger to win the honour. Linebacker Shawne Merriman earned it in 2005.