Korda, ranked No 22, will face Italian Flavio Cobolli, the No 10 seed, next.
Ahead of his victory, Sebastian Korda beat Chilean Cristian Garin (6-3, 6-2), Australian Thanasi Kokkinakis (6-7 (1), 7-5, 3-2 ret.) and Australian Jordan Thompson, the No 7 seed (6-4, 6-2).
Tiafoe, ranked No 29, defeated Colombian Daniel Elahi Galan (6-7 (8), 6-3, 6-3), Aleksandar Kovacevic (7-6 (3), 4-6, 6-3) and Russian Andrey Rublev, the top seed (6-4, 7-6 (3)) in the previous rounds of the Washington D.C. tournament.
Washington ATP 500, other semi-final result (William H.G. FitzGerald Tennis Center, hard, USD 2.100.230):
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