Alexa Guarachi
Alexa Guarachi Mathison is an American-born Chilean tennis player.
She has a career-high WTA singles ranking of No. 347, achieved on 2 November 2015. She reached her highest doubles ranking of No. 38 on 17 February 2020, after her runner-up finish at the St. Petersburg Ladies' Trophy.
Guarachi holds dual American and Chilean citizenship, and represented the United States prior to June 2015.
WTA career finals
Doubles: 6 (1 title, 5 runner-ups)
WTA 125K series finals
Doubles: 1 (1 runner-up)
ITF Circuit finals
Singles: 3 (1 title, 2 runner–ups)
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Loss | 0–1 | May 2014 | ITF Antalya, Turkey | 10,000 | Hard |  Océane Dodin | 6–4, 4–6, 3–6 |
| Win | 1–1 | July 2014 | ITF Vancouver, Canada | 10,000 | Hard |  Yuka Higuchi | 6–3, 1–6, 7–6 |
| Loss | 1–2 | Sep 2015 | ITF Monterrey, Mexico | 25,000 | Hard |  Tereza Mrdeža | 0–6, 7–6, 3–6 |
Doubles: 28 (20 titles, 8 runner–ups)
| Result | W–L | Date | Tournament | Tier | Surface | Partner | Opponents | Score |
| Loss | 0–1 | May 2014 | ITF Antalya, Turkey | 10,000 | Hard |  Kate Turvy |  Victoria Rodríguez Marcela Zacarías | 1–6, 6–1, |
| Win | 1–1 | May 2014 | ITF Antalya, Turkey | 10,000 | Hard | Kate Turvy |  Barbara Bonić Ximena Hermoso | 6–3, 7–6 |
| Loss | 1–2 | Jun 2014 | ITF Civitavecchia, Italy | 10,000 | Clay |  Sally Peers |  Martina Caregaro Anna Floris | 4–6, 4–6 |
| Loss | 1–3 | Jul 2014 | ITF Vancouver, Canada | 10,000 | Hard | Lauren Albanese | Yuka Higuchi Hirono Watanabe | 6–4, 2–6, |
| Loss | 1–4 | Jul 2014 | ITF Austin, United States | 10,000 | Hard | Alexandra Cercone | Catherine Harrison Mary Weatherholt | 2–6, 5–7 |
| Loss | 1–5 | Aug 2014 | ITF Rosarito Beach, Mexico | 10,000 | Hard | Alexandra Cercone | Victoria Rodríguez Marcela Zacarías | 4–6, 1–6 |
| Win | 2–5 | Oct 2014 | ITF Oslo, Norway | 10,000 | Hard | Nina Stojanović |  Maryna Kolb Nadiya Kolb | 6–4, 7–6 |
| Win | 3–5 | Nov 2014 | ITF Oslo, Norway | 10,000 | Hard |  Daria Lodikova | Maryna Kolb Nadiya Kolb | 6–3, 2–6, |
| Win | 4–5 | Dec 2014 | ITF Santiago, Chile | 25,000 | Hard | Lauren Albanese |  Fernanda Brito  Eduarda Piai | 6–4, 6–1 |
| Win | 5–5 | Jan 2015 | ITF Fort-de-France, France | 10,000 | Hard | Shérazad Reix |  Rosie Johanson Gloria Liang | 6–2, 6–1 |
| Win | 6–5 | Jan 2015 | ITF Saint Martin, France | 10,000 | Hard | Ayaka Okuno | Lena Litvak Sonja Molnar | 7–5, 6–3 |
| Win | 7–5 | Apr 2015 | ITF Jackson, United States | 25,000 | Clay | Caitlin Whoriskey |  Kateřina Kramperová Jessica Moore | 6–7, 6–3, |
| Win | 8–5 | Jul 2015 | ITF El Paso, United States | 25,000 | Hard | Jennifer Brady | Robin Anderson Maegan Manasse | 3–6, 6–3, |
| Loss | 8–6 | Sep 2015 | ITF Monterrey, Mexico | 25,000 | Hard |  Hsu Chieh-yu |  Tadeja Majerič  Conny Perrin | 5–7, 3–6 |
| Win | 9–6 | Feb 2017 | ITF Manacor, Spain | 15,000 | Clay | Lauren Embree | Jaeda Daniel Quinn Gleason | 6–1, 7–5 |
| Win | 10–6 | Mar 2017 | ITF Tampa, United States | 15,000 | Clay | Hsu Chieh-yu | Emina Bektas Sanaz Marand | 6–3, 4–6, |
| Loss | 10–7 | Apr 2017 | ITF Jackson, United States | 25,000 | Clay | Ronit Yurovsky | Alla Kudryavtseva  Anna Zaja | 2–6, 0–6 |
| Win | 11–7 | May 2017 | ITF Charleston, United States | 60,000 | Clay | Emina Bektas | Kaitlyn Christian Sabrina Santamaria | 5–7, 6–3, |
| Win | 12–7 | May 2017 | ITF Naples, United States | 25,000 | Clay | Emina Bektas | Sophie Chang  Ulrikke Eikeri | 6–3, 6–1 |
| Win | 13–7 | Jul 2017 | ITF Auburn, United States | 25,000 | Hard | Emina Bektas | Ellen Perez Luisa Stefani | 4–6, 6–4, |
| Loss | 13–8 | Jul 2017 | ITF Granby, Canada | 60,000 | Hard | Olivia Tjandramulia | Ellen Perez Carol Zhao | 2–6, 2–6 |
| Win | 14–8 | Nov 2017 | ITF Toronto, Canada | 60,000 | Hard |  Erin Routliffe |  Ysaline Bonaventure Victoria Rodríguez | 7–6, 3–6, |
| Win | 15–8 | Jan 2018 | ITF Daytona Beach, United States | 25,000 | Hard | Usue Maitane Arconada | Ulrikke Eikeri  Ilona Kremen | 6–3, 6–4 |
| Win | 16–8 | Mar 2018 | ITF Irapuato, Mexico | 25,000 | Hard | Erin Routliffe | Desirae Krawczyk Giuliana Olmos | 4–6, 6–2, |
| Win | 17–8 | Apr 2018 | ITF Pelham, United States | 25,000 | Clay | Erin Routliffe | Maria Mateas María José Portillo Ramírez | 6–1, 6–2 |
| Win | 18–8 | Apr 2018 | ITF Dothan, United States | 80,000 | Clay | Erin Routliffe | Sofia Kenin Jamie Loeb | 6–4, 2–6, |
| Win | 19–8 | May 2018 | ITF Charleston, United States | 80,000 | Clay | Erin Routliffe | Louisa Chirico Allie Kiick | 6–1, 3–6, |
| Win | 20–8 | May 2019 | ITF Bonita Springs, United States | 100,000 | Clay | Erin Routliffe | Usue Maitane Arconada Caroline Dolehide | 6–3, 7–6 |