He took part in the 2012 Summer Paralympics in London and reached the semi-finals, where he was defeated 13–15 by China's Yijun Chen after receiving a red card (penalty hit).

[1] He dedicated his bronze medal both to Hungary and Romania, but mentioned he had received no congratulations from the Romanian Fencing Federation.

[2] In 2013, Osváth took part in both the Foil A and Sabre A events of the IWAS Wheelchair Fencing World Championships in Budapest.

Two days later, in foil, he defeated again top seed Damien Tokatlian and reaped revenge on the Paralympic Games by prevailing 15–8 over Yijun Chen.

[3] In 2014, Osváth took a silver medal in the Sabre A event of the European Fencing Championships in Strasburg after being defeated 8–15 by Romain Noble.