A brilliant 63 from Dustin Johnson saw him surge into a share of the lead at the halfway stage of the BMW Championship.
The US Open carded five birdies and two eagles to reach 14-under at Crooked Stick to join overnight leader Roberto Castro at the head of proceedings.
Castro for his part enjoyed a second straight 65 on Friday and the pair currently sit three shots clear of Paul Casey who occupies third on his own after an impressive 66.
US Ryder Cup wildcard hopeful JB Holmes did his hopes plenty of good with a 64 and is joined in a tie for fourth by Chris Kirk.
After inclement conditions had forced a three-and-a-half-hour suspension in play on Thursday, Johnson made the most of the favourable scoring conditions and the 32-year-old believes he is shaping up nicely heading into the weekend.
He said: “I feel like I’m rolling it well. The irons could still need a little bit of work, I’m not hitting those quite as good as I would like to, but it?s getting there.”