Loh started playing badminton at the age of four at the gate of his house, along with his brothers and his neighbour. At the age of seven, he stopped playing after being looked down on by his seniors, but then resumed playing badminton at age nine.

His talent for the sport earned him a scholarship at the Singapore Sports School’s Badminton Academy. Loh moved to Singapore at the age of 13 to attend the Singapore Sports School’s four-year programme from 2010 to 2013, after graduating he continued his education at Republic Polytechnic (RP), studying Sports and Leisure Management, but then decided to drop out of school to fully focus on his badminton career.

He officially became a Singapore citizen in 2015 and was also one of the country’s representatives competing at the 2015 Southeast Asian Games and won bronze in the men’s singles category.

Especially in the 2021 BWF World Championships men’s singles tournament in Huelva, Spain, Loh (world no. 22) beat reigning Olympic champion and second seed Viktor Axelsen (world no. 1) in the first round with a score of 14–21, 21–9, 21–6 on 14 December. He continued to compete and gradually defeated the opponents Luka Wraber of Austria (world no. 93) 21–4, 21–8, Kantaphon Wangcharoen of Thailand (world no. 20) 21–14, 21–12 and Prannoy HS of India (world no. 32) to win the world championship, an achievement never before achieved by any Singaporean.

In November 2022, according to the Badminton World Federation (BWF) rankings, Loh was promoted to 3rd worldwide. This is considered the pinnacle of his career and is a position that no other badminton player in Singapore has reached, as well as the highest ranking achieved by a Southeast Asian badminton player to date.

According to en.wikipedia.org, tatlerasia.com