Jim Knous shot five straight birdies in a superb seven-under 65 to take a share of the lead with Maverick McNealy in the third round of the Fortinet Championship in California.
Knous charged up the leaderboard in a spectacular front nine of six-under par 30, making a two at the par three second before birdying holes five through nine.
After his only blemish of the day with a bogey five on the 12th, the 31-year-old birdied the 16th and 18th to end Saturday at 14-under par.
He was level with fellow American McNealy, who could not repeat his strong 64 from Friday but did birdie his last three holes to end with a two-under 70.
A group of five players shared third place at 12-under, Chile's Mito Pereira along with Americans Scott Stallings, Max Homa, Troy Merritt and Beau Hossler, while Phil Mickelson was two shots further back after a 67.
Scotland's Russell Knox, four strokes off the pace after two rounds, collapsed with a three-over 75 to be nine shots behind the leaders, while the only other Briton to make the cut - England's David Skinns - shot a 74 to be one-under.
