It has to happen some time - i.e. Tiger Woods losing a major - but the question is when? Of all the majors, however, the US PGA, which starts at Valhalla on Thursday, is the most volatile.

Remember, this is the championship that gave us an unknown as a winner in 1991. Yep, John Daly at Crooked Stick. And this is the major that has provided such winners in the 1990s as Wayne Grady and Mark Brooks. So, you see, anything is liable to happen.

Of course, the truth is that Woods will probably win again - just as he did last year, which means he has has won three of the last four majors. And the players keep telling us that they judge themselves only by what happens in the majors. But, at odds of 13 to 8 favourite, Woods is again a bit too tight for comfort.

Ernie Els, at 12 to 1, will probably feel he is due a win after finishing second in the first three majors of the year. But you've got to reckon that streak, too, is in danger.

So, how about two each-way bets this week? One on Sergio Garcia, runnerup to Woods last year and who has yet to really explode (yet!) this season, who is on offer at 50 to 1 . . . and the other side bet on Notah Begay at 66 to 1.

13-8 - Tiger Woods (US).

12-1 - Ernie Els (SA).

14-1 - Phil Mickelson (US).

20-1 - David Duval (US).

25-1 - Vijay Singh (Fiji), Lee Westwood (Eng), Hal Sutton (US).

33-1 - Colin Montgomerie (Scot).

40-1 - Jim Furyk (US), Tom Lehman (US), Davis Love (US).

50-1 - Sergio Garcia (Sp), Jesper Parnevik (Swe), Loren Roberts (US).

66-1 - Stuart Appleby (Aus), Notah Begay (US), Darren Clarke (Ire), Fred Couples (US), Nick Price (Zim).

Selected others: 100-1 - Padraig Harrington (Ire); 200-1 - Paul McGinley (Ire). Prices supplied by Ladbrokes Ireland.