| 2013-08-26 | US Open | Hard | R128 | 39 |  Gael Monfils | 105 |  Adrian Ungur | 6-1 6-2 6-0 | H2H | 5 | 67 | 5 | 1 | 83.7% | 80.5% | 50.0% | 0/1 |
| 2013-07-28 | Kitzbuhel | Clay | R32 | 45 |  Albert Montanes (7) | 92 | Adrian Ungur | 6-4 6-2 | H2H | 3 | 71 | 8 | 1 | 71.2% | 78.4% | 66.7% | 2/2 |
| 2013-07-22 | Gstaad | Clay | R32 | 78 | Guillermo Garcia-Lopez | 94 | Adrian Ungur | 6-4 6-7(2) 6-1 | H2H | 3 | 120 | 8 | 6 | 45.5% | 82.9% | 61.9% | 1/2 |
| 2013-06-24 | Wimbledon | Grass | R128 | 27 | Benoit Paire (25) | 94 | Adrian Ungur | 6-4 4-6 6-3 6-1 | H2H | 5 | 111 | 26 | 3 | 62.9% | 83.6% | 50.0% | 0/2 |
| 2013-04-22 | Bucharest | Clay | R32 | 62 |  David Goffin | 134 | Adrian Ungur (WC) | 6-3 6-1 | H2H | 3 | 56 | 3 | 1 | 64.4% | 89.7% | 50.0% | 1/1 |
| 2013-02-04 | Montpellier | Hard | R32 | 38 | Julien Benneteau (6) | 100 | Adrian Ungur | 6-3 4-2 RET | H2H | 3 | 52 | 6 | 0 | 57.5% | 82.6% | 76.5% | 0/0 |
| 2013-02-01 | Davis Cup G1 R1: ROU vs DEN | Hard | RR | 103 | Adrian Ungur | - |  Martin Pedersen | 6-2 7-6(3) 4-6 4-6 6-2 | H2H | 5 | - | - | - | - | - | - | - |
| 2013-02-01 | Davis Cup G1 R1: ROU vs DEN | Hard | RR | 103 | Adrian Ungur | - | Thomas Kromann | 6-3 6-4 | H2H | 3 | - | - | - | - | - | - | - |
| 2013-04-05 | Davis Cup G1 R2: ROU vs NED | Hard | RR | 70 |  Igor Sijsling | 124 | Adrian Ungur | 1-6 6-3 6-4 | H2H | 3 | - | - | - | - | - | - | - |
| 2013-04-05 | Davis Cup G1 R2: ROU vs NED | Hard | RR | 52 | Robin Haase | 124 | Adrian Ungur | 6-4 6-4 3-6 6-3 | H2H | 5 | - | - | - | - | - | - | - |
