Former Ryder Cup captain Colin Montgomerie believes it would be "worth a punt" on Rory McIlroy winning six majors in a row by completing a 2015 clean sweep.
The Northern Irishman won the final two major championships of 2014 with victory at the Open in July and the US PGA Championship the following month.
Montgomerie, who captained a European team featuring McIlroy to Ryder Cup glory at Celtic Manor in 2010, believes the 25-year-old can dominate the sport in a way not even Tiger Woods managed.
Speaking to social network site kicca.com, Montgomerie said: "Can he win all four in a year, never mind two? That means six in a row. Wow, that'll be something.
"If you're a betting man, I'm sure there are a lot of people putting money on it, I'm sure it's a 100-1 shot but it's worth a punt. If I was a gambler, which I'm not, I'd put money on that; he's that dominant, and that good."
Montgomerie certainly believes McIlroy is capable of holding all four major titles at the same time by winning the opening two majors of 2015 - the Masters and the US Open.
"The 2015 majors are coming up with the first one, the Masters, in April. Rory McIlroy, having won the Open and the US PGA, he's going for three in a row and if he does that, the US Open will be a big event, to see if he can get that grand slam.
"If he does win the Masters, wow, that US Open will be a big, big, big do indeed."