A long-time English and British No.1, Ouseph's most significant international tournament achievement was becoming the European Men's Singles Champion, winning the title in 2017.

Ouseph was selected as the number one singles player for the English team in the Thomas Cup qualifiers which was held in Poland in February 2010.

In 2014, Ouseph took silver at the European Championships after losing to top seed Jan Ø. Jørgensen of Denmark in Kazan, Russia.

[5] Representing Great Britain at the 2016 Summer Olympics in the men's singles event, he was defeated by bronze medallist Viktor Axelsen from Denmark in quarter finals.

[4] Although he began a degree in Media at Loughborough University, he chose to give it up in favour of his badminton career.