Korean duo Si Woo Kim and Byeong Hun An produced solid starts with matching 3-under 67s at the Charles Schwab Challenge golf tournament for a share of seventh position, five back of runaway first-round leader, Harry Hall of England.
The 27-year-old Kim, who is ranked 11th on the PGA TOUR's FedExCup points list, opened with three consecutive birdies from the 10th to 12th holes on Thursday before trading two more birdies against as many bogeys in the US$8.7 million PGA TOUR event at Colonial Country Club in Fort Worth, Texas.
An, chasing a first PGA Tour win, also got out of the blocks quickly with birdies on Hole Nos. 11, 12, 13 and 14 before picking up another shot on the first hole. However, he dropped bogeys on the fourth and sixth holes to join Kim in a 15-way tie for seventh place who including world No. 1 and last year's runner-up Scottie Scheffler and defending champion Sam Burns.