Augusta - Jordan Spieth completed the greatest 36-hole start in Masters history Friday, firing a six-under par 66 at Augusta National that matched him for the lowest halfway total in any major.
SCORECARD: Masters at Augusta
The 21-year-old American stood on 14-under 130 after two rounds, a bogey-free Friday giving Spieth a Masters midpoint record-matching five-stroke lead over compatriot Charley Hoffman.
"Any time you can set a record here is pretty awesome," Spieth said. "I'm really excited about how I played."
Fourth-ranked Spieth broke the Masters 36-hole low of 13-under 131 set by Ray Floyd in 1976 and nearly broke the low two-round major start of 130.
Spieth missed a seven-foot birdie putt at the 18th hole that would have put him on 129, settling for par to join the 130 group that includes England's Nick Faldo from the 1992 British Open at Muirfield, American Brandt Snedeker from the 2002 British Open at Lytham and German Martin Kaymer at the 2014 US Open at Pinehurst.
"Didn't know what any of these scores meant in history or anything like that," Spieth said. "I just knew I had a good look at birdie and had a good read on it, and it was just barely off."
Spieth, seeking his first major title after a runner-up Masters debut last year, shared the biggest 36-hole lead mark with Floyd in 1976, Jack Nicklaus in 1975 and Herman Keiser in 1946, after Hoffman closed a round of 68 with his lone bogey.
"I'm happy with the way I played," Hoffman said. "I was going for a bogey-free round and unfortunately I didn't close it out."
Spieth pitched from 50 feet to inches from the cup to set up a birdie at the par-five second, sank an 18-foot birdie putt at the fifth and birdied eight after finding a fairway bunker. Spieth made an 18-foot birdie putt at 10 and sank eight-footers for birdie at the par-5 13th and 15th.
Spieth's 36-hole domination, with 15 birdies against one bogey, evoked memories of Tiger Woods' record-setting 1997 Masters romp for his first major title. Woods will remain the youngest Masters champion by about five months even if Spieth wins this year.
"There's a pretty big separation right there," Woods said. "He has played beautifully."
The record 36-hole Masters comeback to win is eight strokes by Jack Burke in 1956 but there are only five rivals to Spieth in that range, Hoffman plus American Dustin Johnson and England's Justin Rose and Paul Casey on 137 and treble Masters winner Phil Mickelson on 138.
Johnson fired a 67 that included a Masters one-round record of three eagles, coming at the second, eighth and 15th par-five holes.
"I made a lot of great shots and then holed some putts," Johnson said.
World number one Rory McIlroy and Woods, a 14-time major champion back after a two-month layoff to work on his game, were on 142, sharing 19th and 12 adrift.
"I'm very proud of what I've done, to be able to dig it out the way I have," Woods said after shooting 69.
Woods, 39, has not won a Masters since 2005, has not won a major since the 2008 US Open and has not won any title since the 2013 WGC at Firestone.
McIlroy, 25, was expected to battle for a third major win in a row that would complete his career Grand Slam, but he flirted with the cut line before a five-under back nine put him on 71.
"I'm really proud of myself the way I fought back," McIlroy said.
Els: long way from over
Spieth, the hottest player in golf over the past month, won his second US PGA title at the Valspar Championship last month, then took second at the Texas Open and Houston Open and opened with a 64 Thursday to become the youngest first-round leader in Masters history.
Before green jacket fittings start, however, Spieth needs to close out the victory, something he could not do last year after leading Sunday on the front nine.
"It's definitely going to play more challenging," Spieth said. "I'm going to have to be more patient, be OK with a bogey here or there."
Four-time major winner and two-time Masters runner-up Ernie Els, nine back on 139, has not given up on catching Spieth. The 45-year-old South African seeks a green jacket in his 21st try.
"It's very impressive," Els said. "It's a long, long way from being finished. A lot of work to be done still."
Second round scores at Augusta National in the Masters:
130 - Jordan Spieth (USA) 64-66
135 - Charley Hoffman (USA) 67-68
137 - Dustin Johnson (USA) 70-67, Paul Casey (ENG) 69-68, Justin Rose (ENG) 67-70
138 - Phil Mickelson (USA) 70-68
139 - Ernie Els (RSA) 67-72
140 - Ryan Moore (USA) 74-66, Bill Haas (USA) 69-71, Kevin Na (USA) 74-66, Kevin Streelman (USA) 70-70
141 - Mark O'Meara (USA) 73-68, Charl Schwartzel (RSA) 71-70, Louis Oosthuizen (RSA) 72-69, Hideki Matsuyama (JPN) 71-70, Adam Scott (AUS) 72-69, Jason Day (AUS) 67-74, Angel Cabrera (ARG) 72-69
142 - Danny Willett (ENG) 71-71, Rory McIlroy (NIR) 71-71, Sergio Garca (ESP) 68-74, Jonas Blixt (SWE) 72-70, Patrick Reed (USA) 70-72, Tiger Woods (USA) 73-69, Russell Henley (USA) 68-74, Bubba Watson (USA) 71-71
143 - Keegan Bradley (USA) 71-72, Ryan Palmer (USA) 69-74
144 - Zach Johnson (USA) 72-72, Webb Simpson (USA) 69-75, Noh Seung-Yul (KOR) 70-74, Geoff Ogilvy (AUS) 74-70
145 - John Senden (AUS) 71-74, Bae Sang-Moon (KOR) 74-71, Erik Compton (USA) 73-72, Hunter Mahan (USA) 75-70, Brooks Koepka (USA) 74-71, Jimmy Walker (USA) 73-72, Morgan Hoffmann (USA) 73-72, Jason Dufner (USA) 74-71, Chris Kirk (USA) 72-73, Rickie Fowler (USA) 73-72, Graeme McDowell (NIR) 71-74, Darren Clarke (NIR) 74-71, Ian Poulter (ENG) 73-72, Thongchai Jaidee (THA) 75-70, Bernd Wiesberger (AUT) 75-70, Vijay Singh (FIJ) 75-70, Jamie Donaldson (WAL) 74-71
146 - Lee Westwood (ENG) 73-73, Matt Kuchar (USA) 72-74, Steve Stricker (USA) 73-73, Cameron Tringale (USA) 71-75, Anirban Lahiri (IND) 71-75, Henrik Stenson (SWE) 73-73
Missed the cut
147 - Bernhard Langer (GER) 73-74, Mikko Ilonen (FIN) 74-73, Jim Furyk (USA) 74-73, Matt Every (USA) 73-74, James Hahn (USA) 73-74, Gary Woodland (USA) 71-76, Luke Donald (ENG) 75-72, Stephen Gallacher (SCO) 71-76, Shane Lowry (IRL) 75-72, Brandt Snedeker (USA) 74-73, J.B. Holmes (USA) 76-71
148 - Brian Harman (USA) 76-72, Ben Martin (USA) 74-74, Billy Horschel (USA) 70-78, Camilo Villegas (COL) 72-76, Joost Luiten (NED) 76-72, Branden Grace (RSA) 75-73
149 - Victor Dubuisson (FRA) 74-75, Corey Conners (CAN) 80-69, Padraig Harrington (IRL) 72-77, Ian Woosnam (WAL) 75-74
150 - Sandy Lyle (SCO) 74-76, Jos Mara Olazbal (ESP) 79-71, Byron Meth (USA) 74-76
151 - Brendon Todd (USA) 80-71, Kevin Stadler (USA) 77-74, Larry Mize (USA) 78-73, Miguel ngel Jimnez (ESP) 78-73, Thomas Bjorn (DEN) 72-79, Antonio Murdaca (AUS) 78-73, Martin Kaymer (GER) 76-75
152 - Matas Domnguez (CHI) 76-76, Tom Watson (USA) 71-81
153 - Fred Couples (USA) 79-74, Trevor Immelman (RSA) 76-77
156 - Robert Streb (USA) 80-76
157 - Scott Harvey (USA) 76-81, Ben Crane (USA) 79-78, Bradley Neil (SCO) 78-79
159 - Yang Gunn (KOR) 85-74
163 - Mike Weir (CAN) 82-81
176 - Ben Crenshaw (USA) 91-85