Tom Brady led the plaudits after Peyton Manning surpassed his single season touchdown record on Sunday, with the New England Patriots quarterback describing the achievement of his Denver Broncos counterpart as incredible.
Manning entered into the weekend game with the Houston Texans on 47 TD passes for the season but the veteran threw four scores to climb one ahead of Brady and claim a record in the NFL.
The 37-year-old had held the record for three years before Brady became the first player to throw 50 in 2007, and the Patriots star is happy to relinquish his record to one of the greats to have ever picked up a football.
"It's an incredible feat," Brady told WEEI sports radio in Boston. "To throw 50 like we did in 2007 was incredible. [Dan] Marino threw 48, then Peyton threw 49, and I was lucky enough to be on the team to throw 50.
"And 51 is unbelievable through 15 games, they've been throwing at an incredible pace, and what they've done offensively and certainly in the passing game has been incredible."
He added: "It's hard to throw one in a game, and to throw four, five or six, like what he's done over this year.
"I remember in 2007 we were throwing them, and I was like, 'Oh my god.' You play all these years where you have not a lot of touchdown passes, and all of a sudden you're throwing four a game. It's pretty incredible."
Manning's performance against the Texans led his team to a 37-13 win and also ensured the Broncos secured the AFC West title with a record of 12-3.
The Broncos have one more game remaining in the regular season - against the Oakland Raiders - and a win will be enough to secure the number one seed in the AFC.