Spieth has mixed feelings after R3

Jordan Spieth has a one-shot lead going into the final round of the Masters on Sunday, but a late slip in round three is playing on his mind.

The defending champion was cruising on the back nine on Saturday, rolling in three birdies over four holes to make up for his double bogey six on the 11th. This stretched his lead out to four shots.

However, a couple poor drives and some very indifferent chipping saw Spieth drop three shots in the final two holes, carding a bogey and a double bogey. 

"It was a really tough finish to go from holding a four-shot lead…to where all of the sudden, now it's anyone's game," the two-time major champ said after the round.

"So it's tough to swallow that. I'm in the lead after 54 holes. If you told me that at the beginning of the week, I'd be very pleased. So it's mixed feelings right now."

With fellow American Smylie Kauffman, one shot behind on two under followed by Japan's Hideki Matsuyama and the veteran Bernhard Langer on one under, Spieth is not taking anything for granted.

"I know I have to shoot a significant under-par round tomorrow in order to win this tournament, when I could have played a different style of golf, like I did on Sunday last year," he added.

Spieth will also have to watch out for world number one Jason Day and the big-hitting Dustin Johnson, who are within touching distance of the lead on even par.