Woods slashed after two-under start
Tiger Woods has been cut to win the Open Championship at Muirfield after getting his bid for glory under way with a round of 69.
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The world number one was making no real progress before a spurt of birdies at 10, 11 and 13 helped him to a two-under par knock and he's now a general 4/1 favourite.
Close behind him is old rival Phil Mickelson, who also shot 69 despite having problems on and around greens he described as too quick.
Last week's Scottish Open winner has won back-to-back before and is a best of 10/1 to do so again with Coral and bwin.
"Woods and Mickelson have been fantastically popular in the last few days and we could regret offering top price on both," said William Hill spokesman Rupert Adams.
In what's an American-dominated market, Zach Johnson is 11/1 with Paddy Power and Coral having landed the first-round lead with a score of 66.
Brandt Snedeker beat Mickelson and Woods by a single stroke on day one and is 14/1, ahead of Ryder Cup colleague Dustin Johnson at a standout 18/1 with Boylesports.
Adam Scott is the shortest of the non-American players at 20/1 having ended the day on level par and it's 25/1 bar.
There was a blow for some punters when both Peter Hanson and Louis Oosthuizen pulled out early on in their rounds, but Sky Bet pledged to refund all bets struck on either player in any market.
"Tiger Woods ends round one as out 3/1 favourite and he's been popular throughout the day," said Sky Bet's John Rhodes.
"The early morning starters tomorrow may well get the better of the conditions, and for Sky Bet a Tiger win would be a disaster.
"Luke Donald was our worst result in the book after being a price-boosted 35/1 but a nine-over 80, his worst ever Major round, has put an end to his chances.
"The round leader market was popular this morning, with Dustin Johnson and Miguel Angel Jimenez trading at short prices before Zach Johnson took command.
"Shiv Kapur briefly took solo lead at -6 through seven holes in the afternoon before fading.
"Injuries to Oosthuizen and Peter Hanson handed an early blow to punters but at Sky Bet we're refunding any bets placed on either player in any market as a gesture of goodwill."
Lee Westwood fared best of the fancied English players in a one-over round of 72 and he's 30/1 with 888sport, but Rory McIlroy and Luke Donald can each be backed at 500s having shot 79 and 80 respectively.