 Finland: Tampere - Singles - Main |
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| 1/16-finals | Olaso G. | Nieminen T. | 2:1 (4:6, 6:4, 6:2) | details | 22.07.2013 |
 Sweden: Bastad - Singles - Qualification |
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| Quarter-finals | Bachinger M. | Nieminen T. | 2:0 (6:4, 6:1) | details | 06.07.2013 |
 Italy: Vercelli - Singles - Main |
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| 1/16-finals | Nieminen T. | Baldi F. | 0:2 (4:6, 2:6) | details | 09.04.2013 |
 United Kingdom: Bath - Singles - Main |
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| 1/16-finals | Nieminen T. | Willis M. | 0:2 (1:6, 4:6) | details | 12.03.2013 |
| United Kingdom: Shrewsbury - Main |
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| Quarter-finals | Goodall J. | Nieminen T. | 2:0 (6:3, 7:6) | details | 08.03.2013 |
| 1/8-finals | Findel-Hawkins J. | Nieminen T. | WO. | details | 07.03.2013 |
| 1/16-finals | Carpenter J. | Nieminen T. | 0:2 (1:6, 3:6) | details | 06.03.2013 |
| United Kingdom: Cardiff - Singles - Main |
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| 1/16-finals | Nieminen T. | Marsalek J. | 1:2 (6:4, 4:6, 5:7) | details | 26.02.2013 |
| United Kingdom: Wirral - Singles - Main |
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| Quarter-finals | Smethurst D. | Nieminen T. | 2:0 (6:2, 6:0) | details | 07.02.2013 |
| 1/8-finals | Chadaj A. | Nieminen T. | 1:2 (6:3, 5:7, 2:6) | details | 06.02.2013 |
| 1/16-finals | Pauffley N. | Nieminen T. | 1:2 (6:4, 4:6, 2:6) | details | 05.02.2013 |
| United Kingdom: Sheffield - Singles - Main |
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| 1/16-finals | Nieminen T. | Krstin P. | CAN. | details | 29.01.2013 |
| United Kingdom: Preston - Singles - Main |
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| 1/16-finals | Fitzpatrick A. | Nieminen T. | 2:0 (6:3, 6:2) | details | 22.01.2013 |
 World: Davis Cup Group I - Singles - Main |
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| | Nieminen T. | Nielsen F. | 2:3 (3:6, 3:6, 6:3, 6:2, 1:6) | details | 21.10.2012 |
| | Nieminen T. | Pedersen M. | 0:3 (2:6, 3:6, 3:6) | details | 19.10.2012 |
 Germany: Essen - Singles - Main |
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| Semi-finals | Struff J-L. | Nieminen T. | 2:0 (7:6, 6:1) | details | 13.10.2012 |
| Quarter-finals | Huta-Galung J. | Nieminen T. | 0:2 (4:6, 4:6) | details | 12.10.2012 |
| 1/8-finals | Puetz T. | Nieminen T. | 1:2 (6:3, 3:6, 4:6) | details | 11.10.2012 |
| 1/16-finals | Pierot M. | Nieminen T. | 0:2 (4:6, 6:7) | details | 09.10.2012 |
| Germany: Leimen - Singles - Main |
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| Semi-finals | Ehrat S. | Nieminen T. | 2:0 (6:3, 6:4) | details | 06.10.2012 |
| Quarter-finals | Vatutin A. | Nieminen T. | 0:1 RET. (0:6, 0:3) | details | 05.10.2012 |
| 1/8-finals | Pauffley N. | Nieminen T. | 0:2 (2:6, 4:6) | details | 04.10.2012 |
| 1/16-finals | Woerner P. | Nieminen T. | 1:2 (2:6, 6:2, 3:6) | details | 02.10.2012 |
| Sweden: Falun - Singles - Main |
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| Quarter-finals | Nieminen T. | Milton J. | 1:2 (3:6, 6:1, 5:7) | details | 27.09.2012 |
| 1/8-finals | Nieminen T. | Brunstrom J. | 2:0 (6:1, 6:1) | details | 26.09.2012 |
| 1/16-finals | Nieminen T. | Tubic I. | 2:0 (6:1, 6:3) | details | 25.09.2012 |
| Sweden: Danderyd-Stockholm - Singles - Main |
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| Final | Arvidsson I. | Nieminen T. | 2:0 (7:6, 6:3) | details | 22.09.2012 |
| Semi-finals | Eleskovic E. | Nieminen T. | 0:2 (5:7, 1:6) | details | 21.09.2012 |
| Quarter-finals | Berta D. | Nieminen T. | 0:2 (6:7, 0:6) | details | 20.09.2012 |
| 1/8-finals | Paukku J. | Nieminen T. | 0:2 (4:6, 2:6) | details | 19.09.2012 |
| 1/16-finals | Olin R. | Nieminen T. | 1:2 (3:6, 7:5, 3:6) | details | 18.09.2012 |
| Finland: Kotka - Singles - Main |
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| Semi-finals | Ivanov V. | Nieminen T. | 2:0 (6:4, 6:4) | details | 17.08.2012 |
| Quarter-finals | Penaud A. | Nieminen T. | 1:2 (7:5, 6:7, 0:6) | details | 16.08.2012 |
| 1/8-finals | Goldsteiner P. | Nieminen T. | 1:2 (3:6, 7:5, 0:6) | details | 15.08.2012 |
| 1/16-finals | Kontinen M. | Nieminen T. | 0:2 (3:6, 3:6) | details | 14.08.2012 |
| Finland: Vierumaki - Singles - Main |
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| Semi-finals | Nieminen T. | Sekulic M. | 1:2 (6:2, 4:6, 4:6) | details | 11.08.2012 |
| Quarter-finals | Nieminen T. | Wennakoski M. | 2:0 (6:3, 6:1) | details | 10.08.2012 |
| 1/8-finals | Nieminen T. | Goldsteiner P. | 2:0 (6:3, 6:1) | details | 09.08.2012 |
| 1/16-finals | Nieminen T. | Rivera C. | 2:0 (6:1, 6:2) | details | 07.08.2012 |
| Finland: Tampere - Singles - Main |
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| 1/16-finals | Nieminen T. | Laaksonen H. | 0:2 (64:7, 4:6) | details | 24.07.2012 |
 Netherlands: Scheveningen - Singles - Main |
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| 1/8-finals | Schukin Y. | Nieminen T. | 2:1 (65:7, 6:1, 6:3) | details | 11.07.2012 |