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
USA
27.01.83, 42 years
27.01.83, 42 years
Kei Nishikori vs. Jason Zimmermann - head to head matches
| 14.07.07 | q 1 | Kei Nishikori | Jason Zimmermann | 6-4, 6-3 | match details |  Los Angeles | Hard |
Kei Nishikori form & Jason Zimmermann form
Kei Nishikori - last matches
 Geneva - Clay | ||||
| 21.05.25 2nd round | vs. Karen Khachanov | 5-7, 5-2, - Kei Nishikori - retired |  | match details |
| 19.05.25 1st round | vs. Learner Tien | 4-6, 6-4, 6-4 |  | match details |
 Madrid - Clay | ||||
| 26.04.25 2nd round | vs. Denis Shapovalov | 1-6, 4-6 | | match details |
| 24.04.25 1st round | vs. Aleksandar Vukic | 6-4, 3-6, 6-3 | | match details |
| Houston - Clay | ||||
| 03.04.25 2nd round | vs. Christopher Eubanks | 1-6, - Kei Nishikori - retired | | match details |
| 01.04.25 1st round | vs. Mitchell Krueger | 6-4, 6-2 | | match details |
| Phoenix Challenger - Hard | ||||
| 15.03.25 1/2 | vs. Joao Fonseca | 3-6, 3-6 | | match details |
| 14.03.25 1/4 | vs. Flavio Cobolli | 6-2, 4-6, 6-4 | | match details |
| 13.03.25 2nd round | vs. Mikhail Kukushkin | 6-3, 2-1, Mikhail Kukushkin - retired | | match details |
| 12.03.25 1st round | vs. Luca Nardi | 6-4, 6-3 | | match details |
| Indian Wells - Hard | ||||
| 07.03.25 2nd round | vs. Ugo Humbert | 4-6, 3-6 | | match details |
| 05.03.25 1st round | vs. Jaume Antoni Munar Clar | 6-2, 5-7, 7-63 | | match details |
| Delray Beach - Hard | ||||
| 11.02.25 1st round | vs. Mackenzie Mcdonald | 6-74, 6-4, 5-7 | | match details |
| Dallas - I. hard | ||||
| 05.02.25 1st round | vs. Tomas Machac | 2-6, 2-6 | | match details |
 Davis Cup - I. hard | ||||
| 01.02.25 | vs. Billy Harris | 6-2, 6-3 | | match details |
| 31.01.25 | vs. Jacob Fearnley | 3-6, 3-6 | | match details |
 Melbourne - Hard | ||||
| 15.01.25 2nd round | vs. Tommy Paul | 7-63, 0-6, 3-6, 1-6 | | match details |
| 12.01.25 1st round | vs. Thiago Moura Monteiro | 4-6, 6-74, 7-5, 6-2, 6-3 | | match details |
 Hong Kong - Hard | ||||
| 05.01.25 fin | vs. Alexandre Muller | 6-2, 1-6, 3-6 | | match details |
| 04.01.25 1/2 | vs. Juncheng Shang | 4-3, Juncheng Shang - retired | | match details |
| 03.01.25 1/4 | vs. Cameron Norrie | 6-3, 3-6, 6-2 | | match details |
| 01.01.25 2nd round | vs. Karen Khachanov | 4-6, 6-3, 7-5 | | match details |
| 31.12.24 1st round | vs. Denis Shapovalov | 6-2, 6-3 | | match details |
 Helsinki Challenger - I. hard | ||||
| 10.11.24 fin | vs. Luca Nardi | 3-6, 6-4, 6-1 | | match details |
| 09.11.24 1/2 | vs. Max Hans Rehberg | 6-4, 6-76, 6-2 | | match details |
| 08.11.24 1/4 | vs. Jacob Fearnley | 6-4, 6-3 | | match details |
| 07.11.24 2nd round | vs. Jerome Kym | 6-3, 1-6, 6-2 | | match details |
| 06.11.24 1st round | vs. Nicolas Alvarez Varona | 6-4, 6-2 | | match details |
 Bratislava 2 - I. hard | ||||
| 02.11.24 1/2 | vs. Roman Safiullin | 4-6, 3-6 | | match details |
| 01.11.24 1/4 | vs. Constant Lestienne | 6-3, 5-7, 6-2 | | match details |
Jason Zimmermann - last matches
| Los Angeles - Hard | ||||
| 14.07.07 q 1 | vs. Kei Nishikori | 4-6, 3-6 | | match details |
| Valencia - Hard | ||||
| 09.04.07 q 1 | vs. Chris Drake | 1-6, 4-6 | | match details |
 Canada F3 - I. hard | ||||
| 19.03.07 1st round | vs. Ryler Deheart | 6-3, 6-73, 4-6 | | match details |
| Canada F1 - I. hard | ||||
| 05.03.07 1st round | vs. Michael Johnson | 6-4, 6-4 | | match details |
| 05.03.07 2nd round | vs. Matt Bocko | 6-3, 6-1 | | match details |
| 05.03.07 1/4 | vs. Frederic Niemeyer | 1-6, 6-2, 6-75 | | match details |
| San Jose - I. hard | ||||
| 10.02.07 q 2 | vs. Travis Parrott | 6-72, 6-75 | | match details |
| 10.02.07 q 1 | vs. Dejan Djokic | 3-6, 7-61, 6-2 | | match details |
| USA F29 - Hard | ||||
| 13.11.06 1st round | vs. Eric Hechtman | 3-6, 7-5, 4-6 | | match details |
 Venezuela F7 - Hard | ||||
| 16.10.06 1st round | vs. Roman Recarte | 7-64, 5-7, 7-5 | | match details |
| 16.10.06 2nd round | vs. Marc Auradou | 3-6, 6-2, 6-72 | | match details |
| Venezuela F6 - Hard | ||||
| 09.10.06 2nd round | vs. Carlos Avellan | 6-4, 6-2 | | match details |
| 09.10.06 1/4 | vs. Yohny Romero | 2-6, 3-6 | | match details |
| 09.10.06 1st round | vs. Sat Galan | 6-76, 6-2, 6-4 | | match details |
| Venezuela F5 - Hard | ||||
| 02.10.06 2nd round | vs. Ricardo Chile-Fonte | 2-6, 4-6 | | match details |
| 02.10.06 1st round | vs. Piero Luisi | 6-4, 6-3 | | match details |
| USA F22 - Hard | ||||
| 11.09.06 1st round | vs. Benedikt Stronk | 3-6, 4-6 | | match details |
| Venezuela F3 - Hard | ||||
| 14.08.06 1st round | vs. Alejandro Kon | 4-6, 6-3, 7-5 | | match details |
| 14.08.06 2nd round | vs. Christoph Palmanshofer | 6-2, 7-5 | | match details |
| 14.08.06 1/4 | vs. Ruben-Dario Torres | 4-6, 6-4, 4-6 | | match details |
| Venezuela F2 - Hard | ||||
| 07.08.06 1/4 | vs. Carlos Palencia | 3-6, 4-6 | | match details |
| 07.08.06 1st round | vs. Miguel Gallardo-Valles | 6-4, 2-1, Miguel Gallardo-Valles - retired | | match details |
| 07.08.06 2nd round | vs. Jose Zunino | 6-3, 6-1 | | match details |
| Venezuela F1 - Clay | ||||
| 31.07.06 1st round | vs. Paolo Beninca | 6-4, 6-3 | | match details |
| 31.07.06 2nd round | vs. Cristian Paiz | 6-73, 3-6 | | match details |
| Los Angeles - Hard | ||||
| 22.07.06 q 1 | vs. Jeff Williams | 2-6, 1-6 | | match details |
| Venezuela #2 - Hard | ||||
| 05.06.06 1st round | vs. Timothy Neilly | 3-6, 1-6 | | match details |
| Venezuela #2 - Hard | ||||
| 29.05.06 1st round | vs. Pablo Gonzalez | 3-6, 4-6 | | match details |
| Venezuela #2 - Hard | ||||
| 22.05.06 1st round | vs. Chris Wettengel | 7-66, 6-4 | | match details |
| 22.05.06 2nd round | vs. Pablo Gonzalez | 2-6, 0-6 | | match details |