Aircraftman Dineshkhanthan Thangarajah of Sri Lanka Air Force won the singles Championship in the 98th National Tennis Championship organized by Sri Lanka Tennis Association (SLTA) held at SLTA Tennis Courts Colombo-7 on 24 August 2013.

Thangarajah the current No 1 Ranking Tennis player in Sri Lanka beat the Sri Lanka Navy player Ordinary Seaman S Athukorala at the finals in four sets (7-5,6-3,4-6,6-2) and this would be the third consecutive year which he won the National Tennis Championship.