Although the Dolphins were unable to match their 17–0 perfect season of 1972, many sports writers, fans, and Dolphins players themselves felt that the 1973 team was better. While the '72 team faced no competition in the regular season that had a record of better than 8–6, the '73 team played against a much tougher schedule that included games against the Oakland Raiders, Pittsburgh Steelers, and Dallas Cowboys (all playoff teams), plus two games against a resurgent Buffalo Bills squad that featured 2,000-yard rusher O.J. Simpson. Miami finished with a 12–2 regular season, including their opening game victory over the San Francisco 49ers that tied an NFL record with 18 consecutive wins. The Dolphins' streak ended in week two with a 12–7 loss to the Raiders in Berkeley, California.
Just like the last two previous seasons, Miami's offense relied primarily on their rushing attack. Fullback Larry Csonka recorded his third consecutive 1,000 rushing yard season (1,003 yards), while running back Mercury Morris rushed for 954 yards and scored 10 touchdowns. Running back Jim Kiick was also a key contributor, rushing for 257 yards, and catching 27 passes for 208 yards. Quarterback Bob Griese, the AFC's second leading passer, completed only 116 passes for 1,422 yards, but threw about twice as many touchdown passes (17) as interceptions (8), and earned an 84.3 passer rating. Wide receiver Paul Warfield remained the main deep threat on the team, catching 29 passes for 514 yards and 11 touchdowns. Also, the offensive line was strong, once again led by center Jim Langer and right guard Larry Little. Griese, Csonka, Warfield, Langer, and Little would all eventually be elected to the Pro Football Hall of Fame.
Miami's "No Name Defense" continued to dominate their opponents. Future Hall of Fame linebacker Nick Buoniconti recovered three fumbles and returned one for a touchdown. Safety Dick Anderson led the team with eight interceptions, which he returned for 163 yards and two touchdowns. And safety Jake Scott, the previous season's Super Bowl MVP, had four interceptions and 71 return yards. The Dolphins were still using their "53" defense devised at the beginning of the 1972 season, where Bob Matheson (#53) would be brought in as a fourth linebacker in a 3–4 defense, with Manny Fernandez at nose tackle. Matheson could either rush the quarterback or drop back into coverage.
In 2007, ESPN.com ranked the 1973 Dolphins as the eight-greatest defense in NFL history, noting that the team "held 11 opponents to 14 points or less, setting a record by allowing just 150 points in a 14-game season. Defensive end Bill Stanfill set a Dolphins' sack record that still stands, with 18.5. In the playoffs and Super Bowl, they allowed only 33 points against Cincinnati, Oakland and Minnesota. Stanfill, Manny Fernandez, Hall of Fame middle linebacker Nick Buoniconti, and safeties Dick Anderson (AP Defensive Player of the Year) and Jake Scott were all named to the 1973 All-Pro team.
MIA - Mandich 7 pass from Griese (Yepremian kick) MIA 28-16
MIA - field goal Yepremian 50 MIA 31-16
MIA - field goal Yepremian 46 MIA 34-16
The Dolphins outgained Cincinnati in total yards, 400–194, and first downs, 27–11, while also scoring on three of their first four possessions and shutting out the Bengals in the second half. The Dolphins racked up 241 yards on the ground, including 106 from Mercury Morris and 71 from Larry Csonka, while receiver Paul Warfield caught 5 passes for 95 yards and a score.