USA
11.08.91, 33 years
13605 $
11.08.91, 33 years
13605 $
Country
Birthdate
Height
Weight
Profi since
Play
Ranking's position
Points
Prize money
Birthdate
Height
Weight
Profi since
Play
Ranking's position
Points
Prize money
Brazil
10.09.88, 36 years
10.09.88, 36 years
Jonathan Chang vs. Renardy Guelfi - head to head matches
| 27.06.16 | q 1 | Jonathan Chang | Renardy Guelfi | 6-0, 6-1 | match details |  USA F23 | Hard |
Jonathan Chang form & Renardy Guelfi form
Jonathan Chang - last matches
| USA F33 - I. hard | ||||
| 22.11.18 1/4 | vs. Andrew Watson | 4-6, 6-76 |  | match details |
| 21.11.18 2nd round | vs. Cannon Kingsley | 3-6, 6-1, 7-5 |  | match details |
| 20.11.18 1st round | vs. Ronnie Schneider | 6-4, 4-6, 6-2 | | match details |
| 18.11.18 qual. | vs. Dillon Early | 6-1, 6-0 | | match details |
| Houston Challenger - Hard | ||||
| 10.11.18 q 1 | vs. Alejandro Gonzalez | 2-6, 3-6 | | match details |
| USA F28b - Hard | ||||
| 26.10.18 1/2 | vs. Roy Smith | 2-6, 2-6 | | match details |
| 25.10.18 2nd round | vs. Michael Redlicki | 6-4, 6-1 | | match details |
| 25.10.18 1/4 | vs. Jack Findel-Hawkins | 4-6, 6-4, 7-63 | | match details |
| 23.10.18 1st round | vs. Lucas Poullain | 6-3, 6-3 | | match details |
| 22.10.18 qual. | vs. Alastair Gray | 6-2, 0-6, 7-64 | | match details |
| 21.10.18 q 2 | vs. Spencer Papa | 3-6, 6-3, 6-1 | | match details |
| USA F28 - Hard | ||||
| 17.10.18 1st round | vs. Oliver Crawford | 1-6, 2-6 | | match details |
| 15.10.18 qual. | vs. Guido Marson | 6-4, 6-2 | | match details |
| 14.10.18 q 2 | vs. Alejandro Vedri Asensi | 6-2, 6-1 | | match details |
| 13.10.18 q 1 | vs. Jonathan Sorbo | 6-0, 6-2 | | match details |
| USA F27 - Hard | ||||
| 10.10.18 1st round | vs. Ryan Peniston | 0-6, 4-6 | | match details |
| 08.10.18 qual. | vs. Tim Ruehl | 6-1, 7-66 | | match details |
| 07.10.18 q 1 | vs. Alexander Knight | 6-3, Alexander Knight - retired | | match details |
| 07.10.18 q 2 | vs. Adam Oscislawski | 6-4, 6-3 | | match details |
| USA F26 - Hard | ||||
| 23.09.18 q 2 | vs. Robert Kelly | 2-6, 2-6 | | match details |
| 23.09.18 q 1 | vs. Jonathan Sorbo | 6-2, 6-1 | | match details |
| Columbus Challenger - I. hard | ||||
| 15.09.18 q 1 | vs. Ricardo Rodriguez-Pace | 4-6, 7-66, 2-6 | | match details |
| USA F21 - Hard | ||||
| 01.08.18 1st round | vs. Martin Joyce | 6-2, 3-6, 2-6 | | match details |
| 31.07.18 qual. | vs. Gage Brymer | 6-4, 6-2 | | match details |
| 31.07.18 q 2 | vs. Alex Blumenberg | 6-2, 6-1 | | match details |
| 29.07.18 q 1 | vs. David Metz | 6-2, 6-0 | | match details |
| USA F20 - Hard | ||||
| 25.07.18 2nd round | vs. Petros Chrysochos | 0-6, 6-3, 4-6 | | match details |
| 24.07.18 qual. | vs. Alexander Cozbinov | 6-3, 6-2 | | match details |
| 24.07.18 1st round | vs. Jenson Brooksby | 6-4, 6-4 | | match details |
| 23.07.18 q 2 | vs. Abhijeet Joshi | 6-1, 6-3 | | match details |
Renardy Guelfi - last matches
| USA F23 - Hard | ||||
| 27.06.16 q 1 | vs. Jonathan Chang | 0-6, 1-6 | | match details |
| USA F21 - Hard | ||||
| 20.06.16 q 1 | vs. Jake Jacoby | 6-71, 3-6 | | match details |
| USA F21 - Hard | ||||
| 29.06.15 q 1 | vs. Tim Kopinski | 2-6, 2-6 | | match details |
| USA F19 - Hard | ||||
| 22.06.15 q 1 | vs. Ian Hyland Glessing | 6-0, 6-2 | | match details |
| 22.06.15 q 2 | vs. Michael Riechmann | 6-712, 4-6 | | match details |
 Florianopolis - Clay | ||||
| 14.04.08 q 1 | vs. Andre Gaidzisnki | 2-6, 6-2, 6-4 | | match details |
| 14.04.08 q 2 | vs. Eric Gomes | 4-6, 3-6 | | match details |
| Brazil F25 - Clay | ||||
| 03.12.07 1st round | vs. Maxime Teixeira | 3-6, 2-6 | | match details |
| Brazil F23 - Clay | ||||
| 19.11.07 1st round | vs. Tiago Lopes (BRA) | 1-6, 2-6 | | match details |
| Brazil F19 - Clay | ||||
| 22.10.07 1st round | vs. Leonel Alberti | 1-6, 6-4, 1-6 | | match details |
| Brazil F17 - Clay | ||||
| 08.10.07 1st round | vs. Fernando Romboli | 4-6, 2-6 | | match details |
| Florianopolis - Clay | ||||
| 23.04.07 q 1 | vs. Rodrigo Guidolin | 3-6, 2-6 | | match details |
