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NEW YORK — Frances Tiafoe and Taylor Fritz set up an all-American semifinal at the US Open with victories Tuesday, guaranteeing the United States a man in the title match at the country’s Grand Slam tournament for the first time in 18 years.

The 20th-seeded Tiafoe made it to the final four at Flushing Meadows for the second time in three years when his quarterfinal opponent, Grigor Dimitrov, stopped playing because of an injury in the fourth set. Tiafoe was leading 6-3, 7-6 (5), 6-3, 4-1...