Third round leaderboard:
-14 G Boyd (Eng) -12 M Manassero (Ita), C Nilsson (Swe) -10 R Finch (Eng), A Velasco (Spa), Pe Lawrie (Ire) -9 J Parry (Eng), C Suneson (Spa), I Garrido (Spa), A Noren (Swe)
Selected others: -7 P Price (Wal), Pa Lawrie (Sco) -4 O Wilson (Eng) -3 A Coltart (Sco) -2 T Bjorn (Den) -1 JM Olazabal (Spa)
Boyd graduated from the Challenge Tour last year
England's Gary Boyd fired a course record-equalling 63 to romp into the lead after three rounds of the Castello Masters in Valencia.
Boyd heads the field by two shots from Italian teenager Matteo Manassero (67) and Swede Christian Nilsson (66).
Tour rookie Boyd, 24, sank six birdies and an eagle for an eight-under-par round and a 14-under total as he chases his maiden title.
Overnight leader Peter Hedblom is five shots off the pace after a 71.
Boyd's compatriots Richard Finch and John Parry are also in contention.
The 33-year-old Finch carded a 67 to lie four off the lead, alongside Spaniard Alvaro Velasco (68) and Irishman Peter Lawrie (67).
Parry, a winner at the Vivendi Cup last month, was another stroke back after beating Boyd to the course record thanks to eight birdies.
"John's my room-mate and we're feeding off each other this year, trying to push each other along," said Boyd.
"A lot of my friends have won on tour. I'm the only one left. I'm going to be trying to change that."
Boyd had picked up four shots to make the turn in 32, and, after two more birdies at 11 and 13, he drove to the green on the 365-yard par-four 14th before a 20-foot putt gave him an eagle.
"At that point I was thinking 59," added Boyd, who has had three top-10 finishes in his last six events, including a second place behind Peter Hanson at the Czech Open.
"I was saying to my caddie 'four more birdie chances' but it wasn't to be."
Nilsson made the green despite this horrendous lie
The 17-year-old Manassero did his chances of becoming the youngest winner on the European Tour no harm with four birdies - the last of those a sensational 40-foot putt from off the green on the 17th.
Victory on Sunday would see Manassero better New Zealander Danny Lee's triumph as an 18-year-old at the 2009 Johnnie Walker Classic.
Last year's runner-up Nilsson miraculously held on to a share of second place after making the most of an inconvenient lie on his approach to the last.
With his ball positioned at the base of a stone wall and an advertising hoarding blocking his route, the 31-year-old still managed to reach the green before saving par.
Nilsson's fellow-Swede Hedblom saw his one-shot second-round lead evaporate with three bogeys in his opening four holes.
He recovered somewhat with four birdies but dropped another shot on the last to complete a sloppy effort. Scotland's Paul Lawrie, the 1999 Open champion, was one shot behind Hedblom overnight but struggled to a one-over 72 and is now seven strokes adrift.