| Challenger Szekesfehervar | 03/13 12:20 | 25 | [177] Manuel Guinard v Filip C Jianu [289] | 2-6,6-2,6-1 | |
| Challenger Rovereto | 02/20 16:40 | 25 | [267] Filip C Jianu v Kaichi Uchida [195] | Retired | |
| Challenger Manama | 02/13 12:45 | 25 | [268] Filip C Jianu v Marek Gengel [264] | 6-7,7-6,6-7 | |
| ITF M25 Bath | 02/09 10:00 | 26 | [267] Filip C Jianu v Daniel Little [443] | 0-6,2-6 | |
| ITF M25 Bath | 02/08 10:00 | 25 | Filip C Jianu v Liam Gavrielides | 6-4,6-0 | |
| Davis Cup | 02/04 08:45 | 45 | Yuttana Charoenphon v Filip C Jianu | 0-6,2-6 | |
| Davis Cup | 02/03 07:10 | 45 | Kasidit Samrej v Filip C Jianu | 4-6,7-6,2-6 | |
| ITF M25 Al Zahra | 01/25 09:00 | 25 | [264] Filip C Jianu v Khumoyun Sultanov [491] | 2-6,1-6 | |
| Challenger Oeiras | 01/11 13:45 | 26 | [269] Filip C Jianu v Pierre-Hugues Herbert [304] | 6-3,3-6,2-6 | |
| Challenger Oeiras | 01/10 12:35 | 25 | [277] Aziz Dougaz v Filip C Jianu [269] | 4-6,5-7 | |
| Challenger Oeiras | 01/08 11:00 | 29 | [341] Joris De Loore v Filip C Jianu [304] | 6-3,6-2 | |
| Challenger Oeiras | 01/07 13:55 | 28 | [304] Filip C Jianu v Raphael Collignon [280] | 6-3,6-2 | |
| Challenger Oeiras | 01/06 13:00 | 27 | [274] Maximilian Neuchrist v Filip C Jianu [304] | 3-6,6-7 | |
| Challenger Oeiras | 01/04 11:00 | 26 | [304] Filip C Jianu v Hamad Medjedovic [255] | 6-2,6-3 | |
| Challenger Oeiras | 01/03 13:10 | 25 | [304] Filip C Jianu v Mark Lajal [403] | 3-6,6-3,7-6 | |
| ITF M15 Antalya | 12/09 06:55 | 27 | [419] Ilya Snitari v Filip C Jianu [319] | Retired | |
| ITF M15 Antalya | 12/08 08:30 | 26 | Yanaki Milev v Filip C Jianu | 6-7,3-6 | |
| ITF M15 Antalya | 12/06 09:15 | 25 | Federico Campana v Filip C Jianu | 2-6,6-0,2-6 | |
| ITF M15 Antalya | 12/04 08:50 | 29 | Filip C Jianu v Rrezart Cungu | 6-2,6-4 | |
| ITF M15 Antalya | 12/03 11:30 | 28 | [306] Filip C Jianu v David Pichler [491] | 6-1,6-2 | |
| ITF M15 Antalya | 12/03 06:55 | 27 | Filip C Jianu v Maxim Shin | 6-1,6-3 | |
| ITF M15 Antalya | 12/02 08:50 | 26 | Filip C Jianu v Sarp Agabigun | 6-1,6-0 | |
| ITF M15 Antalya | 11/29 09:25 | 25 | [306] Filip C Jianu v Ryan Nijboer [433] | 6-4,6-2 | |
| Challenger Yokkaichi | 11/24 01:30 | 26 | [301] Filip C Jianu v James Duckworth [172] | 7-6,2-6,2-6 | |
| Challenger Yokkaichi | 11/22 03:00 | 25 | Filip C Jianu v Duckhee Lee | Retired | |
| Challenger Kobe | 11/14 06:00 | 25 | [300] Filip C Jianu v John Millman [155] | 3-6,6-3,4-6 | |
| Challenger Matsuyama | 11/08 01:00 | 25 | [355] Shintaro Mochizuki v Filip C Jianu [300] | 6-3,6-4 | |
| Challenger Yokohama | 11/03 02:00 | 26 | [306] Filip C Jianu v Nino Serdarusic [280] | 4-6,6-4,5-7 | |
| Challenger Yokohama | 11/01 07:05 | 25 | [216] Hiroki Moriya v Filip C Jianu [306] | 6-7,6-0,4-6 | |
| Challenger Brest | 10/23 08:00 | 14 | Filip C Jianu v Antoine Ghibaudo | 4-6,4-6 |
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.