[4] Known for his courtcraft, mastery of strokes and precise shot placement,[5] he won the Singapore Open singles title five times (including four in succession) and remained unbeaten in that event up until his retirement.

[11] In 1928, he took part in an unofficial open championship organised by the Amateur Sporting Association, where he emerged victorious after defeating See Gim Hock in the final.

[18] In 1930, Vass successfully defended his Singapore Open men's singles title, defeating See Gim Hock in a closely contested match that went to three sets.

[20] In July of the same year, Vass continued his dominance over his peers by defending his Singapore Open crown against See Gim Hock in another three-set battle, winning his third consecutive men's singles title with a score of 15–7, 9–15, 15–12.

[24] In the Singapore Open championships held later that year, Vass won the singles title by overcoming a familiar foe in Sim Gim Hock.

[25] This marked his fourth consecutive victory, which is a tournament record he still jointly holds today with the likes of Wong Peng Soon and Ong Poh Lim.

In the 1933 inter-state tournament between Selangor and Singapore, Vass experienced an unexpected loss to A. S. Samuel in the singles event with the score of 7–15, 15–10 11–15, marking his first defeat in three meetings against him.

[30] In the Singapore Open, Vass returned to play in the singles event and won his fifth title, defeating Seah Eng Hee 15–9, 17–14 in the final.

[34] In 1935, Vass took part in the Singapore Open and reached the mixed doubles final with Alice Pennefather, where they finished as runners-up after losing to Seah Eng Hee and Aileen Wong.

[42] In the 1955 Birthday Honours, Vass's contribution to the civil division in Singapore was recognised when he was made a Member of the Order of the British Empire (MBE).