Jack Sock has moved into the semi-finals at the ATP’s Delray Beach Open by beating Steve Johnson 6-4 7-6.
Sock will play a fellow American on Saturday for a berth in the final: Donald Young, who didn’t even need to play a point to get there.
Young’s quarterfinal opponent, Steve Darcis, withdrew from the tournament, citing personal reasons.
The third-seeded Sock has not dropped a set at the hardcourt event as he seeks his second title of 2017, the third of his career.
Young has never won an ATP title. Sock is 2-0 against Young in previous meetings.
The quarterfinals in the other half of the draw will take place on Friday night when defending champion Sam Querrey meets 2009 US Open champion Juan Martin del Potro, and top-seeded Milos Raonic faces Kyle Edmund.