Carl Schwartzel follows McIlroy at 2/1, Kevin Bradley 7/2 and Darren Clarke is the 11/2 outsider.
“Apart from Rory Mcllroy the majors were won by 100/1 outsiders and it has not come as a surprise that punters are backing Mcllroy to make mincemeat of the field,” said Hill’s spokesman Rupert Adams.
Following his victory at the Portugal Master, William Hill offer 80/1 that Tom Lewis wins the Open championship in 2012 and 5/6 that he wins a major title before the end of 2017.
8/11 Northern Ireland Winner
Grand Slam Of Golf: 11/8 Rory Mcllroy, 2/1 Charl Schwartzel, 7/2 Keegan Bradley, 11/2 Darren Clarke
Tom Lewis 1st Major Win : 5/6 Before the end 2017, 5/6 After 2017 *
Tom Lewis: 80/1 for the 2012 British Open
*Bet void if no major win by 2025.