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