The 21-year-old Texan blows away the Masters field and lays down a marker in 2015.
Spieth equals Tiger Woods with joint-highest ever score at Augusta to cruise to first major.
Spieth leads by four shots going into the final day but Rose and Mickelson are prowling in Georgia.
The American hones in on his maiden major title as Rory McIlroy's hopes end in Georgia.
The American hits an eight-under 64 to lead by three shots at Augusta.
Piers Morgan mocks Niall Horan's caddying skills as he attends Rory McIlroy at Augusta.
Tiger Woods and Phil Mickelson confident McIlroy will become seventh player to win all four majors.
Tiger Woods grouped with Jimmy Walker and Jamie Donaldson for the opening round.
McIlroy bidding for third consecutive victory as uncertainty hangs over Woods' game.
American set to return to action after a two-month break from golf.
Woods is yet to decide to compete in the first major of the year.
14-time major winner has tumbled to 104 after a period of inactivity.
Captain Davis Love III says former world number one is determined to make team after Gleneagles absence.
McIlroy has one tournament left to prepare for his bid to complete a career grand slam at the Augusta Masters
World number 1 launches 3-iron into lake in Miami after finding water with second shot on the 8th.