Zatar won a bronze medal at the
2017 Bolivarian Games in
Santa Marta,
Colombia, teaming with
Camila Giangreco Campiz in the mixed doubles event. That year he was named best male tennis player at the
Tigo Sports awards show in Asunción.
Davis Cup He made his Davis Cup debut in
2015 in the
Americas Zone Group III, defeating
José Gilbert Gómez in straight sets in their first-round tie against
Panama. He went undefeated in group play, winning all four of his matches, before beating
Rowland Phillips in three sets in their victory over
Jamaica in the promotion playoffs. In the
2016 Davis Cup Americas Zone Group II he went 2–2 overall against
Venezuela and
Puerto Rico, defeating the latter to avoid relegation. In
2017, he won only one of his four singles matches, defeating
Haydn Lewis in straight sets while suffering two losses in doubles play with Brítez. Paraguay was relegated to Group III. In
2018, during their opening day tie against Panama, he defeated Walner Espinoza in three sets before teaming with
Diego Galeano to beat Jorge Daniel Chévez and Luis Alejandro Espinoza Bares in doubles. He won all five of his matches in group play before they fell to
Honduras in the promotional playoffs, where Zatar lost in straight sets to
Jaime Bendeck. In
2019 they faced group favorites
Mexico in the quarterfinals in his hometown of
Asunción. Although he and Juan Borna upset
Santiago González and
Miguel Ángel Reyes-Varela in the doubles rubber, Zatar lost both of his singles matches and Paraguay would lose the tie 1–4.{{cite news|url=https://www.fedcup.com/en/news/310773.aspx|title=México ratifica su buen momento al vencer a Paraguay|publisher=fedcup.com|first=Pedro|last=García
Participations: (15–10) • indicates the outcome of the Davis Cup match followed by
the score, date, place of event,
the zonal classification and its phase, and
the court surface. ==See also==