| Singles | |
|---|---|
| 2018 Shymkent Challenger | |
| Champion |  Yannick Hanfmann |
| Runner-up |  Roberto Cid Subervi |
| Score | 7–6(7–3), 4–6, 6–2 |
Singles matches were held in 2018 at the 2018 Shymkent Challenger clay court tennis tournament held June 4 to 9 in Shymkent, Kazakhstan.
Ričardas Berankis was the defending champion but chose not to defend his title.
Yannick Hanfmann won the title after defeating Roberto Cid Subervi 7–6(7–3), 4–6, 6–2 in the final.
Yannick Hanfmann (champion)
Hugo Dellien (semifinals)
Sebastian Ofner (quarterfinals)
Mohamed Safwat (second round)
Nino Serdarušić (second round)
Uladzimir Ignatik (first round)
Enrique López Pérez (first round)
Gonçalo Oliveira (first round)| Semifinals | Final | ||||||||||||
| 1 | Yannick Hanfmann | 6 | 6 | ||||||||||
 Lorenzo Giustino | 1 | 0 | |||||||||||
| 1 | Yannick Hanfmann | 77 | 4 | 6 | |||||||||
| Roberto Cid Subervi | 63 | 6 | 2 | ||||||||||
| Roberto Cid Subervi | 64 | 6 | 6 | ||||||||||
| 2 | Hugo Dellien | 77 | 4 | 1 | |||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | Y Hanfmann | 6 | 6 | ||||||||||||||||||||||||
| WC |  A Avidzba | 4 | 2 | 1 | Y Hanfmann | 6 | 6 | ||||||||||||||||||||
| Q |  T-l Wu | 7 | 6 | Q | T-l Wu | 1 | 0 | ||||||||||||||||||||
 G Clezar | 5 | 4 | 1 | Y Hanfmann | 7 | 7 | |||||||||||||||||||||
| Q | J Rodionov | 6 | 6 | Q | J Rodionov | 5 | 5 | ||||||||||||||||||||
 P Krstin | 3 | 2 | Q | J Rodionov | 6 | 3 | 77 | ||||||||||||||||||||
 L Grigelis | 6 | 7 | L Grigelis | 4 | 6 | 64 | |||||||||||||||||||||
| 7 | E López Pérez | 3 | 5 | 1 | Y Hanfmann | 6 | 6 | ||||||||||||||||||||
| 4 | M Safwat | 7 | 7 | L Giustino | 1 | 0 | |||||||||||||||||||||
| C Gómez-Herrera | 5 | 5 | 4 | M Safwat | 4 | 710 | 4 | ||||||||||||||||||||
| D Petrović | 2r | L Giustino | 6 | 68 | 6 | ||||||||||||||||||||||
| L Giustino | 3 | L Giustino | 7 | 4 | 6 | ||||||||||||||||||||||
| D Muñoz de la Nava | 6 | 6 | Q | K Krawietz | 5 | 6 | 3 | ||||||||||||||||||||
| WC |  G Lomakin | 1 | 4 | D Muñoz de la Nava | 4 | 4 | |||||||||||||||||||||
| Q | K Krawietz | 6 | 6 | Q | K Krawietz | 6 | 6 | ||||||||||||||||||||
| 8 | G Oliveira | 1 | 1 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 5 | N Serdarušić | 7 | 6 | ||||||||||||||||||||||||
| WC | R Khassanov | 5 | 2 | 5 | N Serdarušić | 2 | 4 | ||||||||||||||||||||
| R Cid Subervi | 1 | 6 | 6 | R Cid Subervi | 6 | 6 | |||||||||||||||||||||
| T-h Yang | 6 | 0 | 1 | R Cid Subervi | 6 | 6 | |||||||||||||||||||||
| I Nedelko | 7 | 6 | 3 | S Ofner | 2 | 1 | |||||||||||||||||||||
| WC | D Yevseyev | 5 | 3 | I Nedelko | 6 | 62 | 2r | ||||||||||||||||||||
 A De Greef | 61 | 1r | 3 | S Ofner | 1 | 77 | 4 | ||||||||||||||||||||
| 3 | S Ofner | 77 | 5 | R Cid Subervi | 64 | 6 | 6 | ||||||||||||||||||||
| 6 | U Ignatik | 4 | 77 | 4 | 2 | H Dellien | 77 | 4 | 1 | ||||||||||||||||||
| Q | D Masur | 6 | 64 | 6 | Q | D Masur | 5 | 2 | |||||||||||||||||||
 H Casanova | 0 | 1 | A Nedovyesov | 7 | 6 | ||||||||||||||||||||||
| A Nedovyesov | 6 | 6 | A Nedovyesov | 6 | 1 | 0 | |||||||||||||||||||||
| A Pavić | 6 | 6 | 2 | H Dellien | 3 | 6 | 6 | ||||||||||||||||||||
 A Šetkić | 2 | 4 | A Pavić | 2 | 4 | ||||||||||||||||||||||
| R Ortega Olmedo | 6 | 65 | 0 | 2 | H Dellien | 6 | 6 | ||||||||||||||||||||
| 2 | H Dellien | 3 | 77 | 6 | |||||||||||||||||||||||
Philipp Kohlschreiber was the defending champion, but lost in the second round to Horacio Zeballos.
Feliciano López was the defending champion, but lost in the second round to Yannick Hanfmann.
Tomáš Berdych was the two-time defending champion, but withdrew before the competition began.
Nick Kyrgios was the defending champion, but chose to compete in Beijing instead.
Andrej Martin was the defending champion but chose not to defend his title.
Filip Krajinović was the defending champion but chose not to defend his title.
Filip Krajinović was the defending champion but chose not to defend his title.
Nicola Kuhn was the defending champion but lost in the first round to Yannick Hanfmann.
Fabio Fognini was the defending champion, but lost in the second round to Jürgen Zopp.
Martin Kližan won the title, defeating Denis Istomin in the final, 6–2, 6–2. This was the second final in ATP history to be contested between two qualifiers, the first occurring at the 2015 Apia International Sydney.
Yannick Hanfmann was the defending champion but chose not to defend his title.
Andrej Martin was the defending champion and successfully defended his title, defeating Stefano Travaglia 6–4, 6–4 in the final.
Andrea Collarini was the defending champion but lost in the first round to Marco Cecchinato.
Dominic Thiem was the defending champion and chose not to defend his title, as he was still competing at the 2020 US Open.
Ugo Humbert defeated Andrey Rublev in the final 6–3, 7–6(7–4), to win the singles tennis title at the 2021 Halle Open. Humbert's win earned him his third career ATP Tour singles title and his first ATP 500 victory, and also made him the first French player to win the tournament since Henri Leconte won the inaugural edition in 1993. Both Humbert and Rublev were contesting their first career final on grass.
Yannick Hanfmann was the defending champion but chose not to defend his title.
Carlos Alcaraz defeated Diego Schwartzman in the final, 6–4, 6–2 to win the singles title at the 2022 Rio Open. Alcaraz became the youngest winner of an ATP 500 event since the category was created in 2009.
Matteo Berrettini defeated Andy Murray in the final, 6–4, 5–7, 6–3 to win the singles tennis title at the 2022 Stuttgart Open.
Defending champion Casper Ruud defeated Matteo Berrettini in the final, 4–6, 7–6(7–4), 6–2 to win the singles tennis title at the 2022 Swiss Open Gstaad.
Oscar Otte was the defending champion but chose not to defend his title.