Bearded Andy Murray can win Wimbledon if he continues not to shave, a supporter has said.
After meeting the Duke and Duchess of Cambridge on Monday the world number four said he would have shaved if he knew they were coming to watch him.
He complained the beard was getting painful after several days' growth and suggested he would go for the smooth look.
He insisted he is not superstitious but kept the beard for Wednesday's quarter-final against Feliciano Lopez.
Keith Flett, of the humorous Beard Liberation Front campaign, which every year names a beard wearer of the year, said Murray should copy Tim Henman who persisted with a beard and nearly triumphed at the 2004 French Open.
He said: "Players have beards as lucky charms and don't shave until the end of a tournament or until victory.
"The beard also gives Andy a stronger look, a psychological advantage - there is definitely something to it. Opponents don't like to look over the net and see the beard - it's the face of a warrior. Andy can go all the way if he stays away from his razor."
Not shaving could be a good omen. Five-time winner Bjorn Borg famously let his beard grow all the way through the tournament.
Asked if he would keep the beard, Murray kept his cards close to his chest saying: "I'm not thinking about it at all. It's not something that keeps me up at night - or when I wake up in the morning I'm not really that fussed about it."
He said it is now at the length when it is painful to shave but acknowledged it might be part of his kit in the semi-finals, saying: "Yeah, there's a chance that I might still have some facial hair on Friday, yeah."