McIlroy misses the cut after shooting a 78

VIRGINIA WATER, England - Rory McIlroy missed the cut at the BMW PGA Championship at Wentworth on Friday after an erratic 6-over 78 at the European Tour's flagship event.

The top-ranked Northern Irishman made six bogeys and a double bogey on the par-4 11th, leaving him at 5-over 149 and 4 strokes outside the cutline. He was 15 shots behind clubhouse leader Francesco Molinari, who shot a 69.

Playing his fourth straight event, McIlroy's round was littered with wayward tee shots and feeble putting, which he put down to fatigue.

"I was trying to muster some birdies on the back nine but could not get anything going," McIlroy said. "Coming off the back of three good weeks in the United States, I am in need of a rest. I'll dust myself off for next week [at the Irish Open] and not read too much into it."

McIlroy stuttered on the front nine, going out in 36 with two bogeys and a birdie before his round unraveled at the turn.

FORT WORTH, Texas - Kevin Na went without a bogey in the second round until his final hole, finishing with a 4-under 66 for the lead halfway through soggy Colonial.

Na had a 10-under 130 total for a 2-stroke lead over Ian Poulter.

Masters champ Jordan Spieth was in the lead before losing 4 strokes in a two-hole span. He finished with a 73, 9 strokes worse than his opening round that had him in a four-way tie at the top.