Second year quarterback Dan Marino's passing ability became the focal point of Miami's offense and in 1984 he exploded to set league records with 5,084 passing yards and 48 touchdowns. (Marino's touchdown record was broken by Peyton Manningtwenty years later and the yardage record was broken by Drew Breestwenty-seven years later. The Dolphins attempted early on to make a run at a perfect seasontwelve years after pulling off the feat, as they won their first eleven games but were upended in overtime by the San Diego Chargers. The Dolphins scored more than 500 points for the first and to date only time in their history, as they scored 513 points and finished 14–2, their best record since the undefeated season.
A year after being upended in the playoffs by the Seattle Seahawks the Dolphins routed Seattle 31–10. Dan Marino threw for 264 yards and three touchdowns despite being intercepted twice by Seahawks defensive back John Harris. The Dolphins rushed for 143 yards and a Tony Nathan rushing score as well.
In a shootout, quarterback Dan Marino led the Dolphins to a victory by throwing for 421 yards and four touchdowns with one interception. Steelers quarterback Mark Malone recorded 312 yards and 3 touchdowns, but was intercepted three times.