Rugby in the city of San Antonio de Padua started when a group of students of the Instituto San Antonio moved to Morón to continue their education. In the local institution, a priest related to club Los Matreros invited them to join and practise the sport. As the students' enthusiasm increased, four of them tried to play rugby near the S.A. de Padua Church, being taught by Roberto Schamun, senior player of Buenos Aires Cricket & Rugby Club and Hurling Club. They named the team "Padua Rugby Club". The recently formed club was introduced to the Argentine Rugby Union by the San Isidro Club. Nevertheless, Padua RC would be dissolved soon after. In 1974, two players of Porteño A.C. of General Rodríguez, formed a rugby team in Padua and then met former players of Padua R.C., forming the rugby team of "Ateneo S.A. de Padua", linked to the Franciscal Order. They registered with UAR as members, with Miguel A. Bruno and Eduardo Jar as coaches. The shirt was squared in red and green. Ateneo participated in UAR tournaments as guest team, in "preclasificación" division.
CASA rugby team
In 1981, the Ateneo RC dissolved due to internal problems. Some players went to Gimnasia y Esgrima de Ituzaingó and others to Mariano Moreno. Most players and their coaches decided to join Club Atlético San Antonio de Padua. As part of the club, the rugby team adopted the institution's colors, black, gold and purple. The Municipality of Merlo gave CASA de Padua a vacant land on Antezana street, where the club built a rugby venue. That same year the club debuted playing in Preclasificación, the lowest division of the UAR. One year after, the whole rugby team of GEI joined CASA. In 1983, they took part of UAR championships as guests, two years later the team promoted to the next division, while rugby at the club increased its categories to different age levels. In 1989, CASA de Padua promoted to Ascenso division and two years later promoted to the second division. The first international tour came in 1993, when CASA toured on Namibia and South Africa playing some friendly matches with those national teams. CASA reached the first division in 1995 and went on a tour again, visiting United States and Bahamas to play there. The club would trip to South Africa two more times, in 2001 and 2009. In 2011, CASA was near to be relegated to Grupo III, but the team finally remained in second division after beating La Salle 21-17.