2021 Hall of Fame Open

The 2021 Hall of Fame Open was a men's tennis tournament played on outdoor grass courts. It was the 45th edition of the event, and part of the 250 series of the 2021 ATP Tour. It took place at the International Tennis Hall of Fame in Newport, Rhode Island, United States, from July 12 through July 18, 2021.

Singles

 * Kevin Anderson def. 🇺🇸 Jenson Brooksby, 7–6(10–8), 6–4

Doubles

 * 🇺🇸 William Blumberg / 🇺🇸 Jack Sock def. 🇺🇸 Austin Krajicek / 🇨🇦 Vasek Pospisil, 6–2, 7–6(7–3)

Prize money

 * per team

Seeds

 * 1 Rankings are as of June 28, 2021.

Other entrants
The following players received wildcards into the main draw:
 * Kevin Anderson
 * Ivo Karlović
 * 🇺🇸 Jack Sock

The following players received entry from the qualifying draw:
 * 🇦🇺 Alex Bolt
 * 🇺🇸 Mitchell Krueger
 * 🇦🇹 Sebastian Ofner
 * 🇨🇦 Brayden Schnur

Withdrawals

 * Before the tournament
 * 🇦🇺 James Duckworth → replaced by 🇺🇸 Jenson Brooksby
 * 🇺🇸 Marcos Giron → replaced by Jason Jung
 * 🇫🇷 Adrian Mannarino → replaced by 🇺🇸 Maxime Cressy
 * 🇺🇸 Mackenzie McDonald → replaced by 🇩🇪 Cedrik-Marcel Stebe
 * 🇺🇸 Tommy Paul → replaced by 🇦🇹 Jurij Rodionov
 * 🇮🇹 Andreas Seppi → replaced by 🇮🇹 Paolo Lorenzi

Seeds

 * 1 Rankings are as of June 28, 2021.

Other entrants
The following pairs received wildcards into the doubles main draw:
 * 🇺🇸 William Blumberg / 🇺🇸 Jack Sock
 * 🇰🇿 Alexander Bublik / 🇺🇸 Dennis Novikov

The following pair received entry as alternates:
 * 🇯🇵 Yoshihito Nishioka / 🇯🇵 Yasutaka Uchiyama

Withdrawals

 * Before the tournament
 * 🇦🇺 Matthew Ebden / 🇦🇺 John-Patrick Smith → replaced by 🇫🇮 Harri Heliövaara / 🇦🇺 John-Patrick Smith
 * 🇫🇮 Harri Heliövaara / 🇬🇧 Lloyd Glasspool → replaced by 🇺🇸 Robert Galloway / 🇺🇸 Alex Lawson
 * 🇦🇺 James Duckworth / 🇦🇺 Matt Reid → 🇯🇵 Yoshihito Nishioka / 🇯🇵 Yasutaka Uchiyama
 * 🇺🇸 Marcos Giron / 🇺🇸 Evan King → replaced by Treat Huey / 🇲🇽 Miguel Ángel Reyes Varela
 * During the tournament
 * 🇰🇿 Alexander Bublik / 🇺🇸 Dennis Novikov
 * João Sousa / 🇦🇺 Jordan Thompson