![August 2, 2018: John Isner returns a serve during a Citi Open tennis match at Rock Creek Park in Washington DC. Justin Cooper/(Photo by Justin Cooper/CSM/Sipa USA Stock Photo - Alamy August 2, 2018: John Isner returns a serve during a Citi Open tennis match at Rock Creek Park in Washington DC. Justin Cooper/(Photo by Justin Cooper/CSM/Sipa USA Stock Photo - Alamy](https://c8.alamy.com/comp/2ERFGNX/august-2-2018-john-isner-returns-a-serve-during-a-citi-open-tennis-match-at-rock-creek-park-in-washington-dc-justin-cooperphoto-by-justin-coopercsmsipa-usa-2ERFGNX.jpg)
August 2, 2018: John Isner returns a serve during a Citi Open tennis match at Rock Creek Park in Washington DC. Justin Cooper/(Photo by Justin Cooper/CSM/Sipa USA Stock Photo - Alamy
![Citi Open on Twitter: ".@NickKyrgios pulls out this get out of his bag of tricks 🎾 #CitiOpen https://t.co/Z5m3OEZ390" / Twitter Citi Open on Twitter: ".@NickKyrgios pulls out this get out of his bag of tricks 🎾 #CitiOpen https://t.co/Z5m3OEZ390" / Twitter](https://pbs.twimg.com/media/FZR5IuyXEAEB2z_.jpg:large)
Citi Open on Twitter: ".@NickKyrgios pulls out this get out of his bag of tricks 🎾 #CitiOpen https://t.co/Z5m3OEZ390" / Twitter
![Mubadala Citi DC Open on Twitter: "What. A. Match. 🔥 JJ Wolf rode the American 🇺🇸 crowd to a thrilling 7-5, 4-6, 6-3 win over 9th seed Holger Rune 😵🤩 #CitiOpen https://t.co/dIpElwSrsm" / Twitter Mubadala Citi DC Open on Twitter: "What. A. Match. 🔥 JJ Wolf rode the American 🇺🇸 crowd to a thrilling 7-5, 4-6, 6-3 win over 9th seed Holger Rune 😵🤩 #CitiOpen https://t.co/dIpElwSrsm" / Twitter](https://pbs.twimg.com/ext_tw_video_thumb/1555629226723770369/pu/img/H3OH2Li_ptCFJEyn.jpg:large)