| WTA - Maiorca | 06/18 16:40 | 25 | [26] Carla Suarez Navarro v Lara Arruabarrena [80] | 4-6,6-7 | |
| Open de França - Feminino | 05/30 09:00 | 24 | [8] Petra Kvitova v Lara Arruabarrena [91] | 6-0,6-4 | |
| Open de França - Feminino | 05/28 09:00 | 23 | [95] Lara Arruabarrena v Timea Babos [37] | 7-6,6-3 | |
| WTA - Nuremberga | 05/22 12:50 | 26 | [95] Lara Arruabarrena v Kristyna Pliskova [70] | 3-6,5-7 | |
| WTA - Nuremberga | 05/20 13:10 | 25 | [94] Lara Arruabarrena v Katharina Hobgarski [310] | 7-6,6-1 | |
| WTA - Roma - Qualificação | 05/12 12:55 | 45 | [82] Lara Arruabarrena v Qiang Wang [64] | 6-7,1-6 | |
| WTA - Madrid | 05/07 16:00 | 25 | [82] Lara Arruabarrena v Julia Goerges [12] | 6-2,4-6,2-6 | |
| WTA - Madrid | 05/05 12:30 | 24 | [134] Marta Kostyuk v Lara Arruabarrena [80] | 3-6,6-4,2-6 | |
| WTA - Rabat | 05/01 10:00 | 25 | [52] Aleksandra Krunic v Lara Arruabarrena [80] | 6-2,6-7,6-2 | |
| WTA - Bogotá | 04/15 17:00 | 29 | [132] Anna Karolina Schmiedlova v Lara Arruabarrena [79] | 6-2,6-4 | |
| WTA - Bogotá | 04/14 20:55 | 28 | [79] Lara Arruabarrena v Dalila Jakupovic [141] | 6-1,6-2 | |
| WTA - Bogotá | 04/13 16:45 | 27 | [79] Lara Arruabarrena v Johanna Larsson [73] | 6-1,6-3 | |
| WTA - Bogotá | 04/13 14:00 | 26 | [79] Lara Arruabarrena v Sara Sorribes Tormo [116] | 6-0,6-1 | |
| WTA - Bogotá | 04/11 15:00 | 25 | [79] Lara Arruabarrena v Victoria Rodriguez [304] | 6-2,7-6 | |
| WTA - Charleston | 04/04 23:00 | 25 | [84] Lara Arruabarrena v Madison Keys [14] | 1-6,6-3,3-6 | |
| WTA - Charleston | 04/03 15:00 | 24 | [63] Beatriz Haddad Maia v Lara Arruabarrena [84] | Retired | |
| WTA - Miami | 03/20 21:25 | 23 | [105] Bernarda Pera v Lara Arruabarrena [68] | 7-5,6-4 | |
| WTA - Indian Wells | 03/11 00:30 | 24 | Lara Arruabarrena v Caroline Wozniacki | 4-6,1-6 | |
| WTA - Indian Wells | 03/08 23:30 | 23 | Lara Arruabarrena v Lesia Tsurenko | 3-6,6-3,6-4 | |
| WTA - Indian Wells - Qualificação | 03/06 20:50 | 45 | Lara Arruabarrena v Kristie Ahn | 7-5,6-3 | |
| WTA - Indian Wells - Qualificação | 03/05 22:10 | 44 | Lara Arruabarrena v Ons Jabeur | 6-2,2-6,6-4 | |
| WTA - Acapulco | 02/27 22:00 | 25 | Lara Arruabarrena v Maria Sakkari | 3-6,6-7 | |
| WTA - Budapeste | 02/20 09:00 | 25 | Mihaela Buzarnescu v Lara Arruabarrena | 7-6,6-1 | |
| Fed Cup 2018 | 02/11 15:35 | 27 | Deborah Chiesa v Lara Arruabarrena-Vecino | 6-4,2-6,7-6 | |
| Fed Cup 2018 | 02/11 15:35 | 27 | Jasmine Paolini v Lara Arruabarrena | Cancelled | |
| Fed Cup 2018 | 02/10 16:30 | 27 | Sara Errani v Lara Arruabarrena | 6-1,6-1 | |
| WTA - S. Petersburgo - Qualificação | 01/27 16:25 | 45 | Sabina Sharipova v Lara Arruabarrena | 3-6,7-6,7-5 | |
| Open da Austrália - Feminino | 01/18 00:00 | 24 | Lara Arruabarrena v Barbora Strycova | 3-6,4-6 | |
| Open da Austrália - Feminino | 01/16 00:00 | 23 | Lara Arruabarrena v Richel Hogenkamp | 6-1,6-2 | |
| WTA - Sydney | 01/07 06:55 | 25 | Elena Vesnina v Lara Arruabarrena | 6-2,6-2 |