Singles

• John Isner def. Brandon Nakashima 7–6^(10–8), 7–5

It was Isner's 6th title in Atlanta and 16th title overall.

Doubles

• Reilly Opelka / Jannik Sinner def. Steve Johnson / Jordan Thompson 6–4, 6–7^(6–8), [10–3].

Point distribution

Prize money

_{*per team}

Seeds

Country	Player	Rank1	Seed
CAN	Milos Raonic	22	1
ITA	Jannik Sinner	23	2
GBR	Cameron Norrie	30	3
USA	Reilly Opelka	32	4
USA	Taylor Fritz	37	5
USA	John Isner	39	6
FRA	Benoît Paire	49	7
RSA	Lloyd Harris	51	8

• ¹ Rankings are as of July 19, 2021.^[2]

Other entrants

The following players received wildcards into the main draw:

• Trent Bryde
• Milos Raonic
• Jack Sock

The following player received entry using a protected ranking:

• J. J. Wolf

The following player received entry as special exempt:

• Brandon Nakashima

The following players received entry from the qualifying draw:

• Evgeny Donskoy
• Bjorn Fratangelo
• Peter Gojowczyk
• Christopher O'Connell

Withdrawals

Before the tournament

• Grigor Dimitrov → replaced by Yasutaka Uchiyama
• Egor Gerasimov → replaced by Mackenzie McDonald
• Sebastian Korda → replaced by Denis Kudla
• Adrian Mannarino → replaced by Ričardas Berankis
• Tommy Paul → replaced by Andreas Seppi
• Guido Pella → replaced by Kevin Anderson

Seeds

Country	Player	Country	Player	Rank1	Seed
GBR	Luke Bambridge	GBR	Ken Skupski	124	1
ISR	Jonathan Erlich	MEX	Santiago González	124	2
PAK	Aisam-ul-Haq Qureshi	IND	Divij Sharan	138	3
AUS	Matthew Ebden	AUS	John-Patrick Smith	147	4

• ¹ Rankings are as of July 19, 2021.

Other entrants

The following pairs received wildcards into the doubles main draw:

• Keshav Chopra / Andres Martin
• Nick Kyrgios / Jack Sock