American Jordan Spieth heads into the back nine in the final round of the Masters with one arm inside a green jacket, five shots clear as he looks to become the second youngest champion at Augusta National.

Spieth is one-under through nine holes on Sunday and 17-under for the tournament to increase his overnight four-shot advantage to five over former US Open champion Justin Rose and five-time major winner Phil Mickelson who are tied at 12-under.

Spieth has taken his tournament birdie tally to 25, tying the all time record held by Mickelson, with gained shots on the first, third and eighth holes.

Bogeys on the fifth and seventh holes are his only early blemishes as he seeks to be only the fifth wire-to-wire winner in Masters history, joining Craig Wood in 1941, Arnold Palmer in 1960, Jack Nicklaus in 1972 and Raymond Floyd in 1976.

He would also be the second-youngest winner behind Tiger Woods in 1997 and move to world No.2 behind only Rory McIlroy.

Mickelson is one-under for the round through 10 holes with Dustin Johnson and Hideki Matsuyama next best at 10-under.

Australia’s tilt has been obliterated with Jason Day the best in a tie for 29th, currently three-over on his round through 16 holes to be one-under par for the tournament, a whopping 16 shots back.

John Senden closed with a 72 to be one-over where he was joined by 2013 champion Adam Scott.

Scott had a round to forget – a 74 – after a quadruple-bogey seven on the picturesque par-three 12th.

Geoff Ogilvy closed with a 74 to be three-over.

World No.1 Rory McIlroy is nine-under through 11 holes and 14-time major winner Woods is four-under for the week through 11 after two early bogeys.