Rory McIlroy misses 54-hole cut at Pebble Beach by two strokes

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McIlroy had shot five birdies and one bogey to leave him four-under after 15 holes of the Spyglass Hill course, before a wayward drive gave him another bogey on the 16th.

Dustin Johnson, meanwhile, fired a seven-under 64 to climb into a share of the lead on Friday.

The world number one birdied his opening three holes on the Monterey Peninsula course and finished with a total of seven birdies - his best coming with a 20 foot putt on the fourth.

Hossler didn't drop a shot in his round and is still very much in contention at the half-way stage.

Westwood, tied for second place after the first round with James Nitties of Australia, missed the cut in his first two tournaments of the year before finishing tied for 11th in Malaysia last week.

Defending champion and world number three Jordan Spieth will seek to bounce back from a rare missed cut last week, while McIlroy and Day are keen to build on recent strong performances.

"I'm in a really good position here starting the weekend", said Johnson.

He still makes his living on the golf course, where he's approaching one full year atop the world ranking.

Johnson, victor in 2009 and 2010, birdied five of his first 11 holes, finishing with six birdies and a bogey for a five-under 67.

"I got lucky, my caddy says it is three feet left, and I went with the No. 1 in the world and he said go straight, I chose to go with him, it was a lucky putt", Gretzky said about his game.

After striking a staggering 38 putts on Friday, McIlroy needed only 27 putts on Saturday, though he missed six fairways and nine greens while losing almost a stroke off the tee (-0.997 strokes gained: off-the-tee).

"I just need a few putts to fall", he said. For his second round, he never came close to bogey, hitting all but two greens in regulation and having standard chips on those.

Houston Astros starting pitcher Justin Verlander (18 under with Russell Knox), NHL legend Wayne Gretzky (17 under with Johnson, his son-in-law) and former National Football League quarterback Tony Romo (15 under with Will Zalatoris) headline the other athletes near the top of the Pro-Am leaderboard. "It's just about gathering trophies and trying to be the best golfer that I can be".

Four-time major victor Rory McIlroy opened his United States season with a 68 at Spyglass to share 16th at four under with a host of players including world No.2 Jon Rahm.

"It was a nice way to finish after not getting off to a great start", said Mickelson, playing in the event for the 22nd time.

Big-time Hollywood agent Patrick Whitesell is also in the amateur field, playing alongside three-time major champion Padraig Harrington.