4 p.m. update
The leader board at the Masters has tightnened up on a windy Friday, with Rory McIlroy making a run at leader Jordan Spieth.
Spieth had a double bogey on the sixth hole, then a bogey on No. 9. That helped McIlroy, who is 1-under for the day, to close to within three shots of Spieth and take sole possession of second place.
McIlroy, who needs a Masters victory to complete a career grand slam, is 3-under overall.
There is a four-way tie for third involving Danny Lee, Scott Piercy, Paul Casey and amateur Bryson DeChambeau.