'If he plays the way he did the last round of the Memorial, then no,' said McIlroy.'Guys don't go into majors thinking I have to do this to beat Tiger, I have to do that to beat Tiger. They go in and concentrate on their own game. If it's good enough, it's good enough. If it's not, then so be it.'
McIlroy, who in April finished in a tie for 20th at the Masters in his first major appearance, said driving will be the key for him this week.
'My ball-striking from tee to green is probably the strongest part of my game,' said McIlroy. 'So if I'm hitting the ball well, I should be able to hit 10 or 12 fairways and 13 or 14 greens. I will give myself a few chances to make birdies.'