Claudio Grassi (born 25 July 1985) is an Italian tennis player playing on the ATP Challenger Tour. On 22 August 2011, he reached his highest ATP singles ranking of World No. 300 and his highest doubles ranking of No. 137 achieved on 4 November 2013.
Tour titles
| Legend |
|---|
| Grand Slam (0) |
| ATP Masters Series (0) |
| ATP Tour (0) |
| Challengers (2) |
Doubles
| Outcome | No. | Date | Tournament | Surface | Partner | Opponents | Score |
|---|---|---|---|---|---|---|---|
| Runner-up | 1. | 8 July 2012 | Lima | Clay |  Luca Vanni
|
 Facundo Argüello Agustín Velotti
|
6–7 (4–7), 6–7 (5–7) |
| Runner-up | 2. | 10 February 2013 | Bergamo | Hard |  Amir Weintraub
|
 Karol Beck Andrej Martin
|
6–3, 3–6, [8–10] |
| Winner | 3. | 28 July 2013 | Astana | Hard | Riccardo Ghedin
|
 Andrey Golubev Mikhail Kukushkin
|
3–6, 6–3, [10–8] |
| Winner | 4. | 3 November 2013 | Casablanca | Clay | Riccardo Ghedin
|
 Gero Kretschmer Alexander Satschko
|
6–4, 6–4 |
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