2021 British Open leaderboard breakdown: Collin Morikawa, Jordan Spieth behind Louis Oosthuizen after Round 3 - CBSSports.com

The top of the leaderboard at the 149 Open Championship is stacked with major championship winners, and a dramatic Saturday has set up a highly-anticipated final round at Royal St.

George's with Louis Oosthuizen holding a one-shot lead over Collin Morikawa and a three-shot lead over Jordan Spieth.

After setting the Open Championship 36-hole scoring record, Oosthuizen's one-under 69 on Moving day creates the opportunity for a golfer to go wire-to-wire at The Open for the first time since Rory McIlroy in 2014. .

Among the most significant developments during the third round happened in the final hour of action as Spieth, sitting at 11 under for the championship and arguably the favorite to win with a three-under round going, went bogey-bogey on the 17th and 18th.

It wasn't just the fact that Spieth gave up strokes but specifically that he finished his round by pushing an easy par putt off line in a mental mistake that could echo into Sunday's finish.

Five times since 1997 the winner at the Open overcame a final round deficit of five strokes or more, including Phil Mickelson coming back from five strokes in 2013 and Ernie Els roaring back from six strokes in 2012.

The major championship record for a final round comeback remains Paul Lawrie charging back from 10 shots down before winning the playoff at The Open in 1999, but that's the outlier in our historical precedent. .

Here's how the leaderboard looks at the end of the third round at the 149th Open Championship. .

Louis Oosthuizen (-12): For 36 holes, we saw mostly flawless ball-striking from Oosthuizen, but there was some regression on Saturday.

He still had stellar stuff most of the time throughout the round, keeping his lead with a one-under round of 69. .

The confidence is visible, and after putting on a show for Oosthuizen on Saturday, he'll be back for an encore performance in the final round on Sunday.

Jordan Spieth (-9): I'm ultimately not too concerned about the strokes lost because Spieth can still get that back on Sunday.

I do think the biggest impact those miscues made was how they changed the game for Oosthuizen and Morikawa.

Open and beat out Oosthuizen last month, so there's going to be plenty of pressure if Rahm can go out and post a number.

The front nine took a lot of strokes off the field today, but his three bogeys in the first eight holes set the two-time major winner off pace from the start of his round.

Rick Gehman is joined by Mark Immelman to break down and react to Saturday's third round action at The Open Championship.

Louis Oosthuizen is the 8th player in the last 25 years to lead or co-lead 6 or more major championship rounds in a single season.

2021 Louis Oosthuizen, 198.

2021 Louis Oosthuizen, 198.

'See you again tomorrow.'@Louis57TM will begin the final round of The 149th Open with a one-shot lead over Collin Morikawa. #TheOpen pic.twitter.com/JM3DKbPL6Y.

Louis Oosthuizen: 12th player since 2000 to lead a major outright after rounds 1, 2 and 3.

Spieth bogeys the 18th to go to -9️⃣ Oosthuizen and Morikawa are coming down the last #TheOpen

Bogey-bogey finish for Jordan Spieth may be among the most significant developments here on Saturday

He can get those strokes back on Sunday, but the difference in being -11 and being -9 is huge for his mindset heading into the final round

It's also a boost for Oosthuizen and Morikawa, who will likely be able to play head-to-head in the final group with an eye on the leaderboard

He's down two to Oosthuizen and one to Morikawa

Louis Oosthuizen takes the lead of #TheOpen with a birdie on 16 🐦

We have seen 50 holes of mostly beautiful ball-striking from Louis Oosthuizen, but his second shot at the par-4 15th hole was far from that form

A bad mishit is going to leave him in the rough needing to get up-and-down to save par and maintain his role in this three-way lead with Jordan Spieth and Collin Morikawa

First Morikawa joined the group at 11 when he nearly eagled and settled for birdie at the 14th then Spieth nearly got -12 with a good birdie look at 16 but settled for par

He's tied with Oosthuizen and Spieth at -11 at the top of the board