[4][5] In 1903 he won the international tournament of the Magyar Athletikai Club in Budapest with a victory over Josiah Ritchie.

[6] With his compatriot Kurt von Wessely he celebrated his first important doubles title in the German International Championships.

[8] Kinzl played for the Austrian Davis Cup team during the 1905 World Group semifinal against Australasia.

In 1907, he was the finalist of the Budapest International Doubles Championships partnering von Wessely but eventually lost it to Tony Wilding and Oscar Kreuzer.

[11][12] In July, he participated in the singles event at the Summer Olympics but lost in the first round to Wilberforce Eaves.