 Complete the following phrase:  Dunđerski s first breakthrough achievement was winning the Geneve International Championships. After that he became the best non-national player in Switzerland and held the Swiss International Championships title consecutively between 1924 and 1927. During this period he played for the national team of Switzerland. He played occasionally in his home country and was a member of the HAŠK, the Croatian Academic Sports Club. He participated in the 1924 Summer Olympics in Paris where he lost to John Gilbert in the first round. In doubles, he and Iván Balás advanced to the 