| Urbana – Singles | |
|---|---|
| 2021 JSM Challenger of Champaign–Urbana | |
| Champion |  Stefan Kozlov |
| Runner-up |  Aleksandar Vukic |
| Score | 5–7, 6–3, 6–4 |
J. J. Wolf was the defending champion [1] but lost in the semifinals to Stefan Kozlov.
Kozlov won the title after defeating Aleksandar Vukic 5–7, 6–3, 6–4 in the final.
Daniel Altmaier (second round) Mitchell Krueger (quarterfinals) J. J. Wolf (semifinals) Aleksandar Vukic (final)
Jason Jung (second round)
Prajnesh Gunneswaran (first round)
Blaž Rola (first round) Stefan Kozlov (champion)| Semifinals | Final | ||||||||||||
 Yosuke Watanuki | 68 | 4 | |||||||||||
| 4 | Aleksandar Vukic | 710 | 6 | ||||||||||
| 4 | Aleksandar Vukic | 7 | 3 | 4 | |||||||||
| 8 | Stefan Kozlov | 5 | 6 | 6 | |||||||||
| 3 | J. J. Wolf | 2 | 3 | ||||||||||
| 8 | Stefan Kozlov | 6 | 6 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | D Altmaier | 6 | 6 | ||||||||||||||||||||||||
 M Jaziri | 3 | 4 | 1 | D Altmaier | 2 | 1 | |||||||||||||||||||||
 A Galarneau | 4 | 6 | 0 | Yo Watanuki | 6 | 6 | |||||||||||||||||||||
| Yo Watanuki | 6 | 4 | 6 | Yo Watanuki | 6 | 6 | |||||||||||||||||||||
 P Krstin | 7 | 7 | Q | B Shelton | 2 | 1 | |||||||||||||||||||||
| Q | A Kadhe | 5 | 5 | P Krstin | 6 | 0 | 1 | ||||||||||||||||||||
| Q | B Shelton | 3 | 6 | 6 | Q | B Shelton | 4 | 6 | 6 | ||||||||||||||||||
| 7 | B Rola | 6 | 4 | 4 | Yo Watanuki | 68 | 4 | ||||||||||||||||||||
| 4 | A Vukic | 6 | 6 | 4 | A Vukic | 710 | 6 | ||||||||||||||||||||
| T-l Wu | 3 | 3 | 4 | A Vukic | 6 | 6 | |||||||||||||||||||||
| WC | A Kovacevic | 5 | 6 | 65 | Q |  G Brouwer | 4 | 4 | |||||||||||||||||||
| Q | G Brouwer | 7 | 3 | 77 | 4 | A Vukic | 6 | 6 | |||||||||||||||||||
| G Soeda | 6 | 6 | G Soeda | 2 | 2 | ||||||||||||||||||||||
| T-S Kwiatkowski | 1 | 4 | G Soeda | 6 | 5 | 6 | |||||||||||||||||||||
 M Torpegaard | 2 | 6 | 4 | 5 | J Jung | 4 | 7 | 4 | |||||||||||||||||||
| 5 | J Jung | 6 | 3 | 6 | |||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 6 | P Gunneswaran | 5 | 1 | ||||||||||||||||||||||||
| WC | V Kirkov | 7 | 6 | WC | V Kirkov | 6 | 6 | ||||||||||||||||||||
| Em Nava | 3 | 65 | N Chappell | 2 | 3 | ||||||||||||||||||||||
| N Chappell | 6 | 77 | WC | V Kirkov | 3 | 2 | |||||||||||||||||||||
| K Uchida | 6 | 3 | 3 | J. J. Wolf | 6 | 6 | |||||||||||||||||||||
| Y Uchiyama | 4 | 1r | K Uchida | 3 | 4 | ||||||||||||||||||||||
| T Ito | 3 | 6 | 3 | 3 | J. J. Wolf | 6 | 6 | ||||||||||||||||||||
| 3 | J. J. Wolf | 6 | 3 | 6 | 3 | J. J. Wolf | 2 | 3 | |||||||||||||||||||
| 8 | S Kozlov | 3 | 6 | 6 | 8 | S Kozlov | 6 | 6 | |||||||||||||||||||
| JC Aragone | 6 | 3 | 4 | 8 | S Kozlov | 6 | 6 | ||||||||||||||||||||
| Q | K Smith | 5 | Q | K Smith | 3 | 1 | |||||||||||||||||||||
| M Mmoh | 3r | 8 | S Kozlov | 6 | 6 | ||||||||||||||||||||||
| WC | Ezekiel Clark | 6 | 3 | 3 | 2 | M Krueger | 4 | 4 | |||||||||||||||||||
| C Harrison | 4 | 6 | 6 | C Harrison | 3 | 6 | 4 | ||||||||||||||||||||
 N Mejía | 3 | 3 | 2 | M Krueger | 6 | 1 | 6 | ||||||||||||||||||||
| 2 | M Krueger | 6 | 6 | ||||||||||||||||||||||||
Alexander Zverev defeated Stefan Kozlov in the final, 6–3, 6–0 to win the boys' singles tennis title at the 2014 Australian Open.
Nick Kyrgios was the defending champion, but withdrew before the tournament began.
Sam Querrey was the defending champion, but lost in the second round to Egor Gerasimov.
Sebastian Ofner was the defending champion but lost in the third round to Aleksandar Vukic.
Lloyd Harris was the defending champion but chose not to defend his title.
Peter Polansky was the defending champion but lost in the second round to Strong Kirchheimer.
Casper Ruud defeated Hugo Gaston in the final, 6–3, 6–2, to win the men's singles tennis title at the 2021 Swiss Open.
J. J. Wolf was the defending champion but lost in the semifinals to Stefan Kozlov.
Vasek Pospisil was the defending champion but lost in the first round to Emilio Nava.
Carlos Alcaraz defeated Casper Ruud in the final, 7–5, 6–4 to win the men's singles tennis title at the 2022 Miami Open. It was his first Masters 1000 title, and he became the first Spaniard to win the title. The victory also made Alcaraz, at 18 years and 333 days old, the youngest men's singles titlist in Miami Open history, and the youngest Masters 1000 champion since Rafael Nadal at the 2005 Monte Carlo Masters. Ruud became the first Norwegian to reach a Masters 1000 final, and the first Scandinavian since Robin Söderling at the 2010 Paris Masters.
Federico Coria was the defending champion but chose not to defend his title.
Alex de Minaur defeated Jenson Brooksby in the final, 6–3, 6–3 to win the singles title at the 2022 Atlanta Open. It was de Minaur's second Atlanta title, the first being in 2019.
Mitchell Krueger was the defending champion but lost in the first round to Keegan Smith.
J. J. Wolf was the defending champion but chose not to defend his title.
Stefan Kozlov was the defending champion but lost in the second round to Lucas Gerch.
Christopher Eubanks was the defending champion but lost in the final to Ben Shelton.
Stefan Kozlov was the defending champion but lost in the first round to Prajnesh Gunneswaran.
Dominic Stricker was the defending champion but chose not to defend his title.
Wu Yibing defeated John Isner in the final, 6–7(4–7), 7–6(7–3), 7–6(14–12) to win the singles tennis title at the 2023 Dallas Open. Wu became the first Chinese man in the Open Era to reach an ATP Tour singles final and win a title. He saved four championship points en route to the title.
Taylor Fritz defeated Miomir Kecmanović in the final, 6–0, 5–7, 6–2 to win the singles tennis title at the 2023 Delray Beach Open.