In the singles he had a bye in the first round and lost to eventual Gold medal winner Max Decugis of France.

In the men's doubles tournament, Kasdaglis paired with Ioannis Ballis and won the Silver medal after they were defeated in the final by the French team of Max Decugis and Maurice Germot.

They had a bye in the first round; and in the semifinals, they defeated compatriots Esmée Simirioti and Nikolaos Zarifis in straight sets.

During his studies in Paris, Kasdaglis participated in the French Championships, where he won the men's doubles final in 1898 aside Marcel Vacherot.

In the doubles event, he partnered Major Ritchie and reached the semifinal, in which the eventual champions Norman Brookes and Anthony Wilding proved too strong.