Steve Johnson received a free pass into the Winston-Salem Open semi-finals as Kevin Anderson won through.
Kevin Anderson impressively overcame Borna Coric in their Winston-Salem Open quarter-final on Thursday.
The South African second seed maintained his perfect record in last-eight matches this year thanks to a 6-2 7-6 (7-1) win over Croatian Coric.
Anderson served 10 aces and only allowed Coric to win nine return points, securing victory in one hour, 22 minutes to improve to 6-0 in quarter-finals this year.
The world number 15 dropped his opening set at the ATP 250 event played on hard-courts in North Carolina, but he has been strong since.
Anderson will meet Malek Jaziri after the Tunisian eased past Brazilian sixth seed Thomaz Bellucci 6-3 6-2.
American Steve Johnson received a walk over as Lu Yen-hsun withdrew due to a back injury.
Awaiting Johnson in the last four is Pierre-Hugues Herbert, the French qualifier having overcome Spaniard Pablo Carreno Busta 4-6 7-6 (7-5) 6-2.