MIAMI GARDENS — If Dolphins quarterback Tua Tagovailoa is a razor-sharp 26 of 30 passing in each of his next two games, he’ll finish the season completing 74.7 percent of his passes and narrowly surpass Drew Brees’ all-time single season completion record of 74.4 percent, established in 2018. There’s a chance that happens, but it’s a longshot, similar to the Dolphins’ playoff hopes. It’s been that type of frustrating season for Tagovailoa, who leads the Dolphins (7-8) into Sunday’s game at Cleveland (3-12) having completed a career-best and league-leading 72.9 percent of his passes this season. Tagovailoa was asked the possibility of establishing that completion percent record earlier this month. “That would mean a lot,” he said, “but I think for us, right now, just trying to keep the main goal, the main goal and to find a win this Sunday and go on a run that we’ve been talking about in that locker room as a team, that would be a little more special than any other record I would say.” That didn’t happen.