Alexa Guarachi Mathison (Spanish pronunciation: [aˈleksa ɣwaˈɾatʃi]; born 17 November 1990) is an American-born Chilean tennis player who specialises in doubles. She reached her career-high doubles ranking of world No. 11 in September 2021, and has won five titles on the WTA Tour, most notably the 2021 Dubai Championships alongside Darija Jurak. Guarachi reached her first Grand Slam final at the 2020 French Open with Desirae Krawczyk, and the pair were also semifinalists at the 2021 US Open. They also qualified for the 2021 WTA Finals.