1973 Rainier International Tennis Classic – Singles

The 1973 Rainier International Tennis Classic – Singles was an event of the 1973 Rainier International Tennis Classic tennis tournament played at the Seattle Center Arena in Seattle, Washington, in the United States between September 10 and September 16, 1973. Ilie Năstase was the defending champion, but did not compete in this edition. Second-seeded Tom Okker won the singles title, defeating John Alexander 7–5, 6–4 in the final.

Seeds
• # 🇺🇸 Arthur Ashe (quarterfinals)

• # Tom Okker (champion)

• # 🇺🇸 Tom Gorman (semifinals)

• # 🇺🇸 Cliff Richey (semifinals)

• # 🇬🇧 Mark Cox (quarterfinals)

• # 🇺🇸 Brian Gottfried (quarterfinals)

• # Jaime Fillol (first round)

• # 🇦🇺 John Alexander (final)