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Would you want to be Jimmy Walker and Robert Streb right now? On one hand, you're leading a major championship on a Friday evening. (And if you're Streb, you just shot 63.) That's awesome. That's fun. That's the accomplishment of a lifetime even for seasoned pros like them.

On the other hand ... you have (in order) Jason Day, Henrik Stenson, Martin Kaymer, Patrick Reed, Brooks Koepka, Hideki Matsuyama, Rickie Fowler, Jordan Spieth, Zach Johnson and Adam Scott all within six shots of catching you.

That's terrifying, especially with the way a few of those guys played on Friday at Baltusrol. Day shot 65. Spieth shot 67. Fowler made birdie-eagle at the final two holes. Reed shot 65. Those boys are coming. Maybe not all of them, but you know at least one or two will make a serious run at this lead on Saturday.

Maybe Walker or Streb hangs on. Or maybe Emiliano Grillo (currently tied for third) takes over the tournament. If one of those three takes the trophy, he will have earned it. Neither Streb nor Walker has ever led a major at the halfway point.

"It's going to be a new experience, and it will be fun," said Walker. "I've been in these situations before; not in a major, it's still golf, and you want to go out and win. And you still have to go perform. Doesn't matter what tournament it is. I'm excited."

I wonder if he'll be singing the same tune Saturday night.

1. Nobody catches fire like Jason Day catches fire. Seven birdies in eight holes. Are you serious? Day was running for 63 even with a double bogey at the par-4 7th hole. It was a pretty epic performance from one of the best putters in the world right now. And all while battling sickness this week!

2. Phil Mickelson had the most Phil Mickelson 70 ever. A triple bogey to start followed by 3-under golf the rest of the way to ride the Phillercoaster all the way back to 1 over and a spot in the final two rounds. "I think in the history of the PGA Championship, that's the worst start of any player's round," said Mickelson after his round. "I'd have to look that up."

3. Is 63 getting too easy, or are there just more par-70 courses? Three 63s in the last two weeks. I don't know how I feel about that, though the two at Royal Troon were all-timers. If somebody does it on Saturday and/or Sunday, we're going to need to chat about it further.

4. Rory McIlroy misses second cut of 2016. He did it in spectacular fashion, too. McIlroy needed four shots from 210 yard out on the par-5 18th and he took five to miss the cut by one. He finished first in strokes gained off the tee and nearly last in strokes gained putting. He just had no clue all week other than with his driver.

5. Dustin Johnson snapped his string of 25 straight made cuts. D.J. ejected so hard this week after six straight top 10s on the PGA Tour. He only beat seven of the 20 club professionals at Baltusrol and stumbled to a 72 following his ghastly 77 on Thursday. Johnson was No. 127 in the field in strokes gained off the tee this week. I'd wager that's one of the three worst performances of his career off the tee.

6. Jordan Spieth is lingering. His actual play didn't get talked about a ton because of the bizarre drop he took, but Spieth is just six back and has hit it beautifully this week. He's T6 in strokes gained on approach shots which has been his weakness all season. If a cold putter gets lubricated on the weekend, we could be in for his third major in eight tries.

7. Robert Streb's 63 was not enthralling. Streb shot just the 30th 63 in major championship history, but it was probably also the 30th-most exciting. Even his description of it was boring. "It was a great round," said Streb. "Happy to be a part of that 63 club I guess." Come on, Bob. Get excited!

8. Brooks Koepka is out here on one leg, and we're worried about Jason Day's sniffles. How about Koepka gutting out a 68-67 start on one ankle to get within four of the lead. I hope the cortisone shot is on ice for Sunday if he's in one of the final few pairings.

9. This is Day's tournament to lose. It really feels that way with the way he putted it on Friday. He might not win it, but he's in control of his own destiny at the halfway point -- unless Henrik Stenson forgets which continent he's on for 36 holes again with another unconscious performance. In that case, all bets are off. But as of right now, Day is in the driver's seat.