PERTH, AUSTRALIA - APRIL 09: Pek Cowan and Isireli Naisarani of the Force look on during the round seven Super Rugby match between the Force and the Kings at nib Stadium on April 9, 2017 in Perth, Australia. (Photo by Paul Kane/Getty Images)

Clemson University have won a stunning US College Football Playoff National Championship Final, defeating heavy favourites Alabama University 35-31 after claiming the winning touchdown with one second of the match remaining.

Clemson's victory, the first time the Tigers have won a National Championship since 1981, avenged their defeat to the same opponents in the season-ending match last year.

The South Carolina-based college were behind for most of the game, trailing 24-14 at the end of the third-quarter, with fears that their opponents would run away with the contest and win back-to-back national titles.

However with only one second of the game remaining quarterback Deshaun Watson struck again for the Tigers, throwing a two yard pass to wide receiver Hunter Renfrow to win the national championship for his side.