He won the Gold medal in the under 19 110 metres Hurdles at the Public Schools Athletics meet in 1975[2] He played First XI cricket in a team captained by Sasi Ganeshan and played as a member of the Sri Lanka Schools under 19 team[3] Other teammates included Saliya Ahangama, Guy de Alwis, Arittha R Wikramanayake and Ishak Shahabdeen.
Sharm de Alwis refers to Jayasekera protesting at Trinity's slow scoring by bowling underarm.
[4] Jayasekera played for the Rugby first XV in 1975 (under PL Munasinghe) and 1976 (under Stefan D'Silva's captaincy).
[5] teammates in rugby included PL Munasinghe, Stefan D'Silva (Author), Rienzie Fernando, Shane Pinder, Dr Peter Vanniasingham and Professor Devaka Fernando in the 1975 Rugby team coached by Quentin Israel later described as "the best Thomian team" by sports journalist Sharm de Alwis.
[6] He went on to represent Havelock Sports Club and Sri Lanka in a partnership with fellow centre three quarter PL Munasinghe[7][8] Jayasekera is regarded as one of the best threequarters to play rugby between 1968 and 1982.