| WTA - Bogotá | 04/09 19:35 | 25 | [142] Timea Babos v Lara Arruabarrena [106] | 7-6,4-6,1-6 | |
| WTA - Bogotá | 04/08 15:00 | 25 | Emiliana Arango v Lara Arruabarrena | Cancelled | |
| WTA - Monterrey | 04/02 18:05 | 25 | [403] Greta Arn v Lara Arruabarrena [102] | 7-5,3-6,7-5 | |
| WTA - Miami | 03/18 16:05 | 44 | [99] Lara Arruabarrena v Monica Niculescu [138] | 0-6,6-2,4-6 | |
| WTA - Guadalajara | 03/12 22:00 | 25 | [88] Lara Arruabarrena v Marie Bouzkova [130] | 4-6,4-6 | |
| WTA - Indian Wells | 03/04 22:50 | 44 | [88] Lara Arruabarrena v Iga Swiatek [125] | 1-6,7-6,2-6 | |
| WTA - Dubai | 02/18 16:05 | 24 | [93] Lara Arruabarrena v Dominika Cibulkova [30] | 7-5,1-6,2-6 | |
| WTA - Dubai | 02/16 09:15 | 46 | [94] Lara Arruabarrena v Gabriela Dabrowski [446] | 6-4,6-3 | |
| WTA - Dubai | 02/15 11:55 | 45 | [94] Lara Arruabarrena v Tereza Mrdeza [202] | 6-3,6-2 | |
| WTA - Doha | 02/12 12:20 | 25 | [94] Lara Arruabarrena v Lesia Tsurenko [24] | 3-6,0-6 | |
| WTA - Doha | 02/10 12:30 | 46 | [168] Liudmila Samsonova v Lara Arruabarrena [94] | 6-2,6-4 | |
| WTA - Doha | 02/09 09:30 | 45 | Mariana Ramirez Nieto v Lara Arruabarrena | 1-6,1-6 | |
| WTA - S. Petersburgo | 01/26 16:00 | 45 | [196] Tereza Martincova v Lara Arruabarrena [86] | 3-6,6-1,6-4 | |
| Open da Austrália - Feminino | 01/15 06:15 | 23 | [46] Alize Cornet v Lara Arruabarrena [86] | 6-2,6-2 | |
| WTA - Hobart | 01/05 04:30 | 45 | [82] Lara Arruabarrena v Kaylah McPhee [356] | 1-6,6-3,3-6 | |
| WTA - Auckland | 12/31 02:05 | 25 | [174] Lauren Davis v Lara Arruabarrena [82] | 6-2,6-2 | |
| WTA - Tianjin | 10/08 05:45 | 25 | [73] Lara Arruabarrena v Polona Hercog [86] | 6-7,2-6 | |
| WTA - Pequim | 09/29 05:25 | 46 | [108] Katie Boulter v Lara Arruabarrena [76] | 6-3,6-2 | |
| WTA - Pequim | 09/28 03:00 | 45 | [133] Caroline Dolehide v Lara Arruabarrena [76] | 6-4,4-6,4-6 | |
| WTA - Wuhan | 09/21 04:45 | 45 | [428] Vania King v Lara Arruabarrena [71] | 6-1,6-0 | |
| WTA Seoul | 09/19 06:45 | 25 | [10] Jelena Ostapenko v Lara Arruabarrena [71] | 6-3,6-3 | |
| Open dos EUA - Feminino | 08/29 15:00 | 24 | [23] Barbora Strycova v Lara Arruabarrena [85] | 6-0,6-1 | |
| Open dos EUA - Feminino | 08/27 21:05 | 23 | [87] Kateryna Kozlova v Lara Arruabarrena [85] | 0-6,3-6 | |
| WTA - New Haven - Qualificação | 08/17 16:25 | 44 | [92] Andrea Petkovic v Lara Arruabarrena [84] | 6-1,6-2 | |
| WTA Cincinnati Qual | 08/11 21:05 | 44 | [40] Camila Giorgi v Lara Arruabarrena [78] | 6-3,6-4 | |
| WTA - Gstaad | 07/16 12:25 | 25 | [79] Lara Arruabarrena v Marketa Vondrousova [104] | 3-6,3-6 | |
| Wimbledon - Feminino | 07/05 12:50 | 24 | [88] Lara Arruabarrena v Su-Wei Hsieh [48] | 3-6,3-6 | |
| Wimbledon - Feminino | 07/03 10:30 | 23 | [59] Ana Bogdan v Lara Arruabarrena [88] | 1-6,6-3,6-8 | |
| WTA - Eastbourne - Qualificação | 06/22 11:30 | 45 | [80] Lara Arruabarrena v Katy Dunne [222] | 2-6,2-6 | |
| WTA - Maiorca | 06/20 14:40 | 26 | [80] Lara Arruabarrena v Samantha Stosur [98] | 3-6,4-6 |