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Spieth: I give myself nine out of ten on opening round

Jordan Spieth carded a bogey-free 65. Credit: PA

Two-time major winner Jordan Spieth gave himself nine out of 10 after beginning his bid to secure the third leg of a career grand slam in impressive fashion in the 146th Open Championship.

Spieth carded a bogey-free 65 at Royal Birkdale to share the clubhouse lead with US Open champion Brooks Koepka, whose round included four birdies and an eagle.

The 65s of Ryder Cup team-mates Spieth and Koepka equalled the second lowest first round score in an Open at Birkdale, a shot outside Craig Stadler's record of 64 set in 1983.

But after hitting just five of 14 fairways, Spieth knew there was room for improvement as he looks to add the Open title to his Masters and US Open victories in 2015.

"I thought today's round was extremely important, as they all are, but given the forecast coming in, I thought you really needed to be in the red (under par) today," the 23-year-old said.

"Everything was strong. I give it a nine across the board for everything - tee balls, ball-striking, short game and putting. So things are in check. It's just about keeping it consistent.

"I'd call it a top five major round that I've played. There are scores that I've shot that were closer to par that were better given what I needed to do.

"But I couldn't have done much better today. I essentially missed two greens today in some 15mph winds."

Spieth frustrated with poor Saturday finish

Spieth bogeyed the 17th and double bogeyed the 18th. Credit: PA

Defending champion Jordan Spieth admitted he would struggle to forget how his poor finish had left the destiny of the 80th Masters up in the air.

Spieth held a four-shot lead with two holes to play on a windswept day at Augusta National, but bogeyed the 17th and double bogeyed the 18th after wild drives to card a 73 and finish three under par, just a shot ahead of fellow American Smylie Kaufman.

''I just have to absolutely throw it away, the finish to this round, pretend it's a new round, everyone is tied and you have to shoot the best score to win," said Spieth, who is aiming to become the fourth player after Jack Nicklaus, Sir Nick Faldo and Tiger Woods to win back-to-back titles.

"(I have to) understand it's the position I wanted to be in after 54 holes and not think about the finish to this round.' It's going to be very difficult. I played the last three holes, the last two days, five over par. There was no challenge in those holes really.

"If I'm at five, six under, that certainly brings anyone who is over par almost out of the tournament. And now with very little wind (on Sunday), someone gets on a run and shoots six, seven under, I know I have to shoot a significant under par round in order to win this tournament, when I could have played a different style of golf like I did on Sunday last year."

Asked how he would clear his head, Spieth joked: "Probably go break something really quick, have dinner and watch a movie. I think it will be tough personally. That wasn't a fun last couple holes to play from the position I was in."

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Spieth replaces McIlroy as world number one

Jordan Spieth has replaced Rory McIlroy as world number one after finishing second to Jason Day in the US PGA Championship.

Jordan Spieth is the new world number one. Credit: PA

McIlroy finished 17th at Whistling Straits on his return to action following the ankle injury which kept him out of the Open and Bridgestone Invitational, two tournaments he won last year.

And that meant Spieth became the second youngest player after Tiger Woods to top the rankings, despite being unable to claim a record-equalling third major title in one season.

Day's first major title lifts him from fifth to third and means the world's top three are aged 22, 26 and 27 respectively.

Supreme Spieth threatens to win third golf major of 2015

Jordan Spieth in action at Whistling Straits. Credit: Mark Hoffman/Zuma Press/PA

Jordan Spieth stormed into contention for an historic third major title in 2015 after a dramatic third round of the US PGA Championship at Whistling Straits.

Spieth was five shots behind with just two holes to play as Jason Day threatened to take control with six threes in succession from the ninth, including four birdies and an eagle.

However, the gap was suddenly reduced to two when Spieth birdied the 17th as Day was taking two shots to get out of bunker to double bogey the 15th, and it was down to one when Spieth carded his sixth birdie in eight holes to complete a stunning back nine of 30 and a flawless 65.

Day responded superbly with a birdie from 25 feet on the 17th to shoot 66 and finish 15 under par, two shots clear of Spieth with England's Justin Rose and South African Branden Grace one shot further back.

Masters and US Open champion Spieth is now 50 under par for this year's majors as he looks to become only the second player after Ben Hogan and Tiger Woods to win three majors in a season - Woods was 53 under in winning the US Open, Open and US PGA in 2000.

Jordan Spieth shows why he's heavily backed at Open

Dustin Johnson moved to five under after driving to the 332-yard par-four ninth but playing partner Jordan Spieth's birdie attempt, set up in more conventional fashion, just brushed the edge of the hole as both turned in 31.

Speith has started the Open Championship brightly. Credit: PA

Streb's 12-foot par save at the 17th allowed him to finish with a six-under 66 and set the new target while Lingmerth, after his front nine equalled the St Andrews record set by Tony Jacklin (1970), Ian Baker-Finch and Paul Broadhurst (both 1990), came home in 40 for a three-under 69.

Johnson holed from close range to move joint top on six under with eight holes - albeit it the more difficult ones - still to play and almost holed his birdie attempt from the fringe of the 11th green.

Spieth, from a similar position, benefited from the read and sank his putt to join his compatriot at the top.

Both could not capitalise on the 348-yard par-four 12th despite Johnson smashing his drive pin-high just right of the green.

American 21-year-old Jordan Niebrugge tied the Old Course record for lowest score by an amateur at the Open with a five-under 67.

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Nicklaus backing youngsters to shine after Spieth win

Spieth dominated The Masters from start to finish. Credit: PA

Jack Nicklaus believes it is time for the "young guys to take over" after Jordan Spieth's record-breaking Masters victory on Sunday.

"That was an incredible performance," six-time Masters champion Nicklaus said in a statement. "It was so apparent that he learned down the stretch last year, but you have to remember he was only 20 at the time.

"Now he's a grizzled veteran at 21 years old - just 21. Jordan is so beyond his years. I like everything about the young man. He's polite. He's humble. He handles himself so well, on and off the golf course. And he's obviously a wonderful player and now a Masters champion. I think Jordan Spieth is a great person - just as I think Rory McIlroy is - to carry the mantle for the game of golf.

"I am someone who likes the new generations. I always have. I think it energises the game of golf. We had Arnold's (Palmer) generation, then it came to my generation, then Tom Watson came along and right on down the line to Tiger and Rory.

"And now we have Jordan Spieth. There are some older players who have been terrific for a long time, but actually this might be time for the young guys to take over."

Spieth tweeted about his Masters win earlier:

Jordan Spieth takes four shot Masters lead

Jordan Spieth set out to defy the odds and move a step closer to a first major title as the 79th Masters resumed at Augusta National on Friday.

Jordan Spieth is determined to defy the odds at the Masters. Credit: Reuters

Spieth held a three-shot lead overnight after carding a superb opening 64 which was just one shot outside the course record and the lowest score recorded in men's major championship history.

The last player to hold the outright lead after the first round and go on to win was Ben Crenshaw in 1984, although Trevor Immelman was joint leader on his way to the green jacket in 2008.

But Spieth showed no signs of faltering as he picked up birdies on the second and fifth to move to 10 under par and four shots ahead of Australian Jason Day, with Ernie Els, Charley Hoffman, Justin Rose and Sergio Garcia another stroke behind.