The 1989 U.S. Men's Clay Court Championships was a Grand Prix men's tennis tournament held in Charleston, South Carolina in the United States.

It was the 21st edition of the tournament and was held from May 8 to May 15, 1989.

Sixth-seeded Jay Berger won the singles title.

Jay Berger defeated Lawson Duncan 6–4, 6–3 Mikael Pernfors / Tobias Svantesson defeated Agustín Moreno / Jaime Yzaga 6–4, 4–6, 7–5