On 7 August 2017, she reached her highest WTA singles ranking of No. 73 whilst her best doubles ranking is No. 85, achieved on 19 September 2016. Cepede Royg has won one doubles title on the WTA Tour, one WTA 125K doubles title, and 14 singles and 20 doubles titles on the ITF Circuit. Playing for Paraguay at the Fed Cup, Cepede Royg has a win–loss of 61–26. She participated in the 2012 London Olympics, losing in the opening round to American Varvara Lepchenko in three sets, as well as the 2016 Rio Olympics and 2020 Tokyo Olympics. Her best performance at a Grand Slam tournament to date was reaching the fourth round of the 2017 French Open.