On cusp of history, Phil Mickelson shoots 63 at British Open

TROON SCOTLAND- JULY 14 Patrick Reed of the United States tees off on the 6th hole during the first round on day one of the 145th Open Championship at Royal Troon

Getty Images Patrick Reed took advantage of the benign conditions Thursday to start the British Open with a 5-under 66

Whether to turn professional and leave school.

Live second-round coverage of the British Open will begin Thursday morning at 1:30 a.m. ET on the Golf Channel. "I just couldn't make a decision".

Royal Troon wouldn't be a bad place to start.

Spieth, 22, made a point to say the Zika virus wasn't the only health concern that moved him to opt out, instead emphasizing overall health concerns.

"I'll probably watch the Olympics, but I'm not sure golf will be one of the events I watch", said the four-time major champion who dropped out of the Games a couple of weeks ago.

And he will have trying times watching the Games in August. I've been very fortunate to do what I've done in golf and I feel like I've used that success in a positive way.

“I dont think were going to see the course like this for the rest of the week, ” he said. "I thought about all this ahead of time". I went to go get it. His ball was dead on line to roll into the cup, but at the very end caught the right edge and spun slowly out, hanging on the lip. I'll be texting with Rickie (Fowler), obviously, throughout. "I don't think Tiger really hit a driver".

"It will loom over me throughout the Olympic Games, for sure", Spieth said. "I'm a huge believer in Olympic golf". I'm a huge believer in playing for your country, showing I absolutely look forward to Summer and Winter Olympics.

"But squash certainly asked for a pledge from all the top players to sign it saying we would be there if we got in the Olympics, and golf also came up with a pledge that golfers signed to say if it got in the Olympics they would be there".

The weather tomorrow is expected to worsen but the cut appears as if it might fall around the score Day is on now so he needs to play solidly tomorrow to firstly make the cut and to play well if he is to make progress.

"But at the same time, no one can stand there and categorically tell you you're going to be okay, and that's the problem". Nobody's going to understand what it's like in my shoes.

Spieth's loss to the Olympics will not be the gain of the John Deere Classic, which is being played opposite the Games, beginning on August 11.

"I want to shed a tear right now", Mickelson said. "So because of that, I'm not thinking much of it".

Umbrellas and rain gear were nowhere to be seen on a sun-splashed, warm, and attractive day along the Scottish coast as the world's best golfers took to the links of Royal Troon Golf Club.

TROON, Scotland - Phil Mickelson charged up the leaderboard at the British Open on Thursday, grabbing the first-day lead and a share of the record for the best score in a major championship.

"So working hard for it". Now we'll see who are the hardened shotmakers, the men who can survive in significant wind and heavy rain.

Reed acknowledge that coming to Scotland and playing last week's Scottish Open proved a great decision.

This was a Southern Californian who was perceived as soft, who supposedly did not embrace the ground game links golf demands. Does that mean this week it may? I don't know what else they're looking for.

"It's one of these golf courses that allows you to get off to a quick start, allows you to get nearly over-confident and cocky, and all of a sudden you get a little too careless on the back nine and you can go shoot 31-41".

He's already dealt with one tough situation this week.

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