1985 Buick WCT Finals – Singles

John McEnroe was the defending champion but lost in the quarterfinals to Joakim Nyström.

Ivan Lendl won in the final 7–6, 6–4, 6–1 against Tim Mayotte.

Seeds
A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.

• # 🇺🇸 John McEnroe (quarterfinals)

• # 🇺🇸 Jimmy Connors (semifinals, retired)

• # Ivan Lendl (champion)

• # 🇸🇪 Mats Wilander (quarterfinals)