Augusta amateur Jeff Knox has much to share with Tiger Woods and Rory McIlroy

Top-ranked Rory McIlroy and 14-time major winner Tiger Woods, each seeking a milestone Masters victory on Sunday, appear to have a key adviser in common - Augusta National ace Jeff Knox.

Should either golf superstar capture the green jacket next weekend - McIlroy to complete a career grand slam and win his third major in a row or Woods for a fifth time to end a seven-year major win drought, he might just owe some thanks to 51-year-old Knox - who set the Augusta National members course record of 61 in 2003.

McIlroy was famously outplayed by non-competing marker Knox in last year's Masters third round, the Northern Ireland star shooting 71 to Knox's 70. And Woods played his practice round on Friday at Augusta National with Knox, according to a Golf Channel report, just before announcing that he would play in the Masters, ending a lay-off that began on February 5 when he withdrew after 11 holes at Torrey Pines.

Woods, 39, has been nagged by back injuries for much of the past year, his quest simply to complete 72 holes becoming a soap opera sideshow.

"I'm playing in the Masters," Woods said. "I've worked a lot on my game and I'm looking forward to competing."

McIlroy, 25, won last year's British Open and PGA Championship and has established himself as the world's top player, but yearns for the only major crown to have eluded him. "It's a matter of being prepared and not over-thinking it," McIlroy said.

Knox, already the envy of the golf world for his role as a marker if an odd number of players make the Masters cut, was deeply praised last year by McIlroy.

"Jeff is a great player," McIlroy said at the time.