Borza reached a career high ATP singles ranking of 707 achieved on 11 September 2017.

In 2010, the 13-year-old Borza reached five finals in the U14 circuit of the Tennis Europe Junior Tour and won three of them, including the U14 Dyadora Cup at Timisoara, in which he beat his fellow countryman and junior career rival Nicolae Frunză in the final.

1 slot in the U14 category of the Tennis Europe rankings with a win, but instead he was now just 10 points behind the then leader, Andrey Rublev.

[2] Four months later, however, Borza beat Rublev in the final of the U14 Bohemia Cafex Cup in three sets.

[1][4] In July, Borza competed in the European Junior Championships at Plzeň, beating future World No.