Career
He competed in the 1906 Intercalated Games in Athens. Kasdaglis participated in all three tennis events (men"s singles, men"s doubles and mixed doubles) at the 1906 Intercalated Games. In the mixed doubles he partnered Aspasia Matsa.
They had a bye in the first round and in the second round defeated compatriots Esme Simiriotis and Nikolaos Zarifis in straight sets.
In the semifinal the French couple Marie Decugis and Max Decugis proved too strong. Kasdaglis and Matsa were awarded the Bronze medal.
He was a finalist in the singles event of the Northern Lawn Tennis Championships in 1903 and 1907. He competed in singles and doubles events at the 1907 Wimbledon Championships.
In the doubles event he partnered Major Ritchie and reached the semifinal in which the eventual champions Norman Brookes and Tony Wilding proved too strong.
His second and last Wimbledon participation was at the 1922 Championships where he played in the doubles and mixed doubles events and reached the second round in both. He is the brother of tennis player Dionysios Kasdaglis.