| Challenger Luedenscheid | 08/15 13:30 | 14 | Lambert Ruland v Filip C Jianu | 4-6,2-6 | |
| Challenger Prague | 08/12 10:30 | 26 | [322] Filip C Jianu v Jonas Forejtek [318] | 2-6,6-4,1-6 | |
| Challenger Prague | 08/10 08:00 | 25 | [322] Filip C Jianu v JC Aragone [307] | 6-0,6-2 | |
| Challenger Segovia | 07/26 14:00 | 25 | [323] Filip C Jianu v Mathias Bourgue [205] | 3-6,4-6 | |
| Challenger Pozoblanco | 07/21 15:00 | 26 | [249] Federico Zeballos v Filip C Jianu [319] | 7-6,6-4 | |
| Challenger Pozoblanco | 07/19 16:30 | 25 | [319] Filip C Jianu v Nicolas Alvarez Varona [488] | 6-2,6-4 | |
| Challenger Iasi | 07/15 09:00 | 26 | [324] Filip C Jianu v Riccardo Bonadio [278] | 6-7,2-6 | |
| Challenger Iasi | 07/13 07:00 | 25 | Dan Alexandru Tomescu v Filip C Jianu | 4-6,3-6 | |
| Challenger Salzburg | 07/05 09:00 | 19 | [267] Jiri Lehecka v Filip C Jianu [324] | 7-5,6-4 | |
| Challenger Salzburg | 07/04 08:00 | 14 | [382] Miljan Zekic v Filip C Jianu [324] | 6-7,3-6 | |
| ATP Eastbourne | 06/19 14:20 | 14 | [329] Filip C Jianu v James Duckworth [92] | 4-6,3-6 | |
| Challenger Almaty | 06/16 06:00 | 26 | [285] Riccardo Bonadio v Filip C Jianu [329] | 6-1,7-6 | |
| Challenger Almaty | 06/15 04:00 | 25 | [265] Tung-Lin Wu v Filip C Jianu [329] | 4-6,5-7 | |
| Challenger Almaty | 06/14 04:00 | 19 | [338] Filip C Jianu v Vladyslav Orlov [374] | 6-7,1-6 | |
| Challenger Almaty Qual | 06/13 08:00 | 14 | Filip C Jianu v Danil Ozernoy | 6-2,6-1 | |
| Challenger Almaty | 06/10 05:30 | 26 | [338] Filip C Jianu v Dmitry Popko [195] | 5-7,3-6 | |
| Challenger Almaty | 06/08 10:20 | 25 | [257] Teymuraz Gabashvili v Filip C Jianu [338] | 1-6,3-6 | |
| Challenger Almaty | 06/07 06:30 | 19 | [338] Filip C Jianu v Ivan Gakhov [484] | 4-6,7-5,7-6 | |
| Challenger Almaty | 06/06 06:00 | 14 | [338] Filip C Jianu v Tsung-Hua Yang [409] | 6-2,6-3 | |
| Challenger Oeiras | 05/28 11:55 | 27 | [349] Filip C Jianu v Nuno Borges [275] | 4-6,4-6 | |
| Challenger Oeiras | 05/27 13:35 | 26 | [274] Chun Hsin Tseng v Filip C Jianu [349] | 3-6,6-3,1-6 | |
| Challenger Oeiras | 05/25 14:00 | 25 | [328] Johannes Haerteis v Filip C Jianu [349] | 3-6,0-6 | |
| Challenger Oeiras | 05/24 10:00 | 19 | [349] Filip C Jianu v Federico Zeballos [268] | 6-4,7-5 | |
| Challenger Oeiras | 05/23 10:00 | 14 | [349] Filip C Jianu v Francisco Cabral [331] | 6-7,6-4,6-2 | |
| ITF M25 Vic | 05/19 13:50 | 25 | Filip C Jianu v Carlos L-Montagud | 6-7,4-6 | |
| ITF M15 Antalya | 05/07 06:55 | 27 | [341] Filip C Jianu v Orlando Luz [331] | 1-6,6-3,3-6 | |
| ITF M15 Antalya | 05/06 11:10 | 26 | [341] Filip C Jianu v Jacopo Berrettini [301] | 6-2,6-4 | |
| ITF M15 Antalya | 05/04 11:20 | 25 | Filip C Jianu v Dali Blanch | 6-2,6-3 | |
| Challenger Tallahassee | 04/23 18:00 | 27 | [375] Filip C Jianu v Denis Kudla [117] | 6-7,6-3,5-7 | |
| Challenger Tallahassee | 04/22 16:25 | 26 | [375] Filip C Jianu v Joao Menezes [201] | 6-4,6-4 |
Filip Cristian Jianu (born 18 September 2001) is a Romanian tennis player.
Jianu has a career high ATP singles ranking of No. 264 achieved on 16 January 2023 and a doubles ranking of No. 451 achieved on 10 April 2023. He is currently the No. 1 Romanian player.
Jianu has a career high ITF junior ranking of No. 5 achieved on 4 February 2019.
Jianu represents Romania at the Davis Cup.