SINGAPORE, Nov 11, 2012 (AFP) - Tournament director Jose Maria Zamora had his "fingers crossed" for no more disruptions as he announced the tournament would go the full four rounds, rather than being cut to three, and extend into Monday morning if required.
As Italy's Manassero completed his third round, the fourth was already well under way as the tournament played catch-up following long delays for thunder and lightning storms on Thursday and Friday.
"We will be finishing it either today, fingers crossed, or tomorrow morning.
All parties have agreed to do it," Zamora said in a statement. Weather forecasts predicted scattered thunderstorms for Sunday.
Manassero, 19, led from 2010 British Open winner Louis Oosthuizen, who can hamper world number one Rory McIlroy's bid to add this season's European Tour money list title to his triumph on the PGA Tour.
Manassero shot a third round 64 at the par-71 Sentosa Golf Club for an aggregate score of 11-under-par 202. England's Chris Wood was three off the pace, while three-time winner Adam Scott was four back as the fourth round started.
McIlroy left himself with a mountain to climb after finishing his third round with a 69, and the Northern Irishman, 23, admitted he now needed a wonder round of 10 under par or better.
"It depends what the leaders do on the back nine. It's a tough course but there are plenty of birdie chances out there, so if I can shoot one in the low 60s and get into double digits under par, you never know what can happen," McIlroy said.
Leading scores at the storm-interrupted Barclays Singapore Open after the third round was completed on Sunday (par-71):
202 - Matteo Manassero (ITA) 70-68-64
204 - Louis Oosthuizen (RSA) 70-69-65
205 - Chris Wood (ENG) 70-65-70
206 - Adam Scott (AUS) 71-66-69
207 - Joost Luiten (NED) 71-68-68, Anirban Lahiri (IND) 71-68-68, Thomas Bjorn (DEN) 66-67-74
208 - Paul Casey (ENG) 68-73-67, Adilson Da Silva (BRA) 72-70-66, Chan Yih-shin (TPE) 71-69-68, Chapchai Nirat (THA) 65-73-70, Francesco Molinari (ITA) 69-67-72
209 - Y.E. Yang (KOR) 68-73-68, Gaganjeet Bhullar (IND) 71-69-69, Prom Meesawat (THA) 70-70-69, Rory McIlroy (NIR) 70-70-69, Liang Wenchong (CHN) 74-66-69, Jaco Van Zyl (RSA) 68-71-70, Shiv Kapur (IND) 70-68-71, Anders Hansen (DEN) 69-69-71, Rikard Karlberg (SWE) 69-69-71, George Coetzee (RSA) 72-63-74
Selected:
211 - Miguel Angel Jimenez (ESP) 74-66-71
212 - Phil Mickelson (USA) 73-70-69
214 - Colin Montgomerie (SCO) 72-71-71