Rory McIlroy's monstrous lead disappears, surprise contender surges as Masters comes down to final day

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In case you thought the Masters was over after Rory McIlroy's electrifying second round, here's your reminder that nothing gets started in Augusta until the back nine on Sunday.

And those final nine holes are sure to be exciting after Saturday's third-round action that saw McIlroy's six-shot lead, the largest ever through 36 holes, completely evaporate.

New York native Cameron Young and the reigning champion McIlroy will be paired together as the final grouping of the 90th playing of the Masters, with both golfers at 11 under.

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Rory McIlroy and Cameron Young are tied for the Masters lead going into Sunday. (Katie Goodale/Imagn Images, Jared C. Tilton/Getty Images)

McIlroy started his day at 12 under, but a bogey on the first combined with three birdies by Patrick Reed saw his lead shrink rapidly. When McIlroy birdied the third, and Reed bogeyed No. 4, McIlroy’s lead was back to a comfortable four. Reed eventually fell down the leaderboard, but Young shot up it.

Young, who was 4 over after his first round, began the day eight shots back of McIlroy, birdied the 16th to tie McIlroy, just seconds before McIlroy bogeyed 12 to fall to second place. He shot a 7-under 65 to jump to the top of the leaderboard, while McIlroy went 1 over with a 73. Young birdied eight holes to go along with a bogey on the par-5 15th after going water.

But McIlroy struggled on the back nine, going in the water on 11 for a double bogey, while also bogeying 12 and 18.

Rory McIlroy reacts after a putt on the 18th green during the third round of the Masters Tournament at Augusta National Golf Club in Augusta,