He began playing table tennis in his hometown club Budapesti VSC where his father, Gábor Gárdos worked as a coach.

[8] In the team event, Austria (Robert Gardos, Chen Weixing, Werner Schlager) just missed out a medal as they fell short against South Korea (Oh Sang-Eun, Ryu Seung-Min, Yoon Jae-Young) in the bronze final by a scoreline 1–3.

After an easy victory in the first round (Egypt, 3–0),[10] the team faced eventual bronze medalist Germany and lost without winning a single match (0–3),[11] thus finishing tied-fifth.

[12] In June 2015, he competed in the inaugural European Games, for Austria in table tennis, more specifically, Men's team with Stefan Fegerl and Daniel Habesohn.

In the first round, he defeated Chew Zhe Yu of Singapore (4–2), before losing to Chinese player, and number 4 seed Zhang Jike, (2–4).