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Cornish rookie Harry Hall carded four consecutive birdies around the turn to take a three-shot halfway lead at the Charles Schwab Challenge.
Hall followed his opening round 62 with a 66 as he moved to 12-under par, three clear of American Harris English, who tied his round of 66 with a hole in the eighth at Colonial Country Club in Fort Worth, Texas. illuminated.
Argentina’s Emiliano Grillo is a shot further behind after a day-best round of 65.
Former Walker Cup star Hall is chasing his first PGA Tour win after two Top 10 finishes in his rookie season to date.
Starting at the 10th, he bogeyed at the 13th to return that shot two holes later and carded four straight birdies around the turn to consolidate his position at the top of the leaderboard.
That run ended with a bogey on the third, but he birdied the seventh and holed out on the eighth after plugging in the side on his second attempt to avoid a greenside bunker.
English did better on the 170-yard eighth where he made his first ace on the hole since Jim Furyk in 2011.
Adam Schenk, Byeong Hun An and Robby Shelton were tied for fourth, one stroke behind Grillo and one ahead of Andrew Novak and world number one Scotty Scheffler, who had lost in a play-off 12 months earlier and his second consecutive round. Was of 67.
Justin Rose, who won at Colonial five years ago, finished tied for ninth at 5-under after a bogey-free 66.
Michael Block, the 46-year-old club pro from California, who earned the invitation after finishing tied for 15th at the US PGA Championship, finished last in the 120-strong field at 15-over par but improved by seven strokes on his opening round of 81. Did. ,