British Open 2015: How to View Monday's Live Leaderboard Scores, Updates

The dream of the in-season Grand Slam is alive and well for Jordan Spieth.  

Five strokes behind after two rounds in the weather-delayed British Open, Spieth roared back into contention during Sunday's third round when he shot a six-under par 66 and got to 11 under for the tournament.

While Spieth moved to within one stroke of the lead, 36-hole leader Dustin Johnson had his worst round of the tournament on a day when the field went low.

The winds died down dramatically and it seemed like nearly every golfer in the field took advantage except Johnson, who shot a shocking three-over 75. Johnson hit the ball fairly well throughout the round, but he could not make meaningful putts at any point. Johnson is seven under par for the tournament and is five strokes behind leaders Jason Day, Louis Oosthuizen and Paul Dunne.

Paul Dunne?

No, this is not a game of which name does not belong. Dunne is an amateur who played his college golf at Alabama-Birmingham. He has played the best golf of his life in the first three rounds at St. Andrews, as he has fired 69-69-66 through the first three rounds, and he is gunning to become the first amateur to win a major since 1933. No amateur has won the British Open since Bobby Jones accomplished the feat in 1930.

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Paul Dunne first amateur since Jim Simons in 1971, 4th overall to hold share of lead at major. http://t.co/33CLkI5WZW pic.twitter.com/YIKH1zID6u

— NBC Sports (@NBCSports) July 19, 2015"

Dunne, who hails from Ireland, maintained a sense of humor despite the pressure of his position. When he was interviewed by ESPN's Tom Rinaldi after the round, the reporter asked him what he would try to do when he stepped onto the first tee in Monday's round. Without missing a beat, Dunne cracked that he wanted to "make contact" with the ball.

He will have a lot of work to do if he is going to hold off Spieth, Day, Oosthuizen or any of the 14 golfers who are at nine under par or better.

Spieth was confident after the match that he had turned things around with his sharp play in the third round. 

"A round like today gets the job done tomorrow. But I don't think much less. Right now I feel even more calm than the [US] Open when I was certainly feeling better than the Masters," Spieth told Rinaldi (h/t CBS Sports). "I feel I have a little bit more experience in this position. I know that now it just takes patience. I did what I needed to do today."

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Maybe just me, but if it's 1875, isn't Jordan Spieth is a Texas Ranger? (Slept in the saddle, ate as they rode.) And if he's after you....

— Thomas Boswell (@ThomasBoswellWP) July 20, 2015"

Oosthuizen is in a position to repeat the success he had when he won the British Open in 2010. He has been razor-sharp from tee to green through the first three rounds, and he has missed just seven greens in regulation through the first 54 holes.

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Sneaky, sneaky: Louis Oosthuizen quietly ties for #TheOpen lead through 54: http://t.co/GonnCXnFkO pic.twitter.com/U9d0Kf5Ae4

— Golf Channel (@GolfChannel) July 19, 2015"

Day is gunning for his first major title, and he has been fully healthy after battling vertigo at the U.S. Open last month. He knows that if he can take the lead when he walks over the Swilcan Bridge on the 18th hole Monday and win the tournament, he will have the greatest accomplishment of his golfing career.

"That little piece of immortality and glory that comes with winning the claret jug at the home of golf at St. Andrews," Day told Steve Douglas of the Associated Press, "it would be an unbelievable piece of experience that no one could ever take away from you." 

Adam Scott is lurking at nine under par, and he could have been up with the leaders if he had made a few more putts. After shooting a 67 in the second round, he let several opportunities slip through his grasp and shot 70 on Sunday.

Still, with perhaps the sweetest swing in the game, he appears to be quite dangerous heading into the final round. 

David J. Phillip/Associated Press

Scott feels good about his chances. "I was slightly off my rhythm and the swing than the last couple of days and it was a little frustrating because it was there to be had," Scott told Bruce Matthews of Golf Australia. "I didn't make all the putts that I could've, but three back, I mean, it's not a lot, really, so I've got a chance."

Coverage of the final round of the British Open can be seen on ESPN at 6 a.m. ET.