Spieth’s excellent round saw him break the 36-hole record of 131 shots, set by Ray Floyd 39 years ago, by one as he finished day two on a commanding 14-under-par.

The 21-year-old, one of the rising stars in world golf, now has a five-shot lead over nearest competitor and compatriot Charley Hoffman, who did his best to keep the pressure on Spieth as he entered the clubhouse on nine under.

Another American in Dustin Johnson is a shot further back, as are English duo Paul Casey and Justin Rose as all three are tied for third on seven-under.

American favourite Phil Mickelson enjoyed a fruitful back nine to end on six-under.

South African Veteran Ernie Els, who rolled back the years with a good display on day one, is five-under and four-time Masters champion Tiger Woods is three shots back on two-under.

World number one Rory McIlroy, chasing a career Grand Slam, endured a difficult time out on the tricky Augusta course, although he did birdie the last two holes, and he is some way adrift of the lead with a current score of two-under-par.

But much like the first day’s play, the plaudits rightly went to the talented Spieth, who has built a dominant lead over the opening two rounds.

Spieth, chasing his maiden career major, resumed on his overnight score of eight under and was in blistering form from the off, demonstrating remarkable composure which belied his tender years.

He birdied the second and the fifth which was an ominous start for the rest of the field who will continue to chase him down over the next two days.

The American has made just one bogey over his first 36 holes and looks in good stead to bounce back from last year’s disappointment, where he finished as joint runner-up to compatriot Bubba Watson.

Despite being in pole position to become the second youngest Masters winner behind Woods, Spieth is remaining cool ahead of the third day’s play tomorrow and the deciding round on Sunday (April 12).

“I got off to a great start and had a chance to win last year on Sunday,” Spieth said.

“I'd like that same opportunity.

“This is halfway and I'm aware of that.

“I'm not going to get ahead of myself."

The third round will see the field reduced as players on a score of worse than two-over-par will be eliminated from the 79th edition of golf’s most prestigious tournament.