Tong joined the world tour in 2008 and has risen up the rankings ever since, becoming a consistent member of the world’s top 50 in recent years. She reached a career high of world No.37 in June 2023 after reaching the second round of the El Gouna International. After being eliminated in the 2023 Hong Kong Open, Tong made it to the quarter-finals of the New Zealand Open, a World Tour silver tournament, where she was beaten by second seed Tinne Gilis of Belgium over three games. Her best result so far in 2024 was the runner-up at the Van Lawn Open in Vancouver, a Challenger Tour 15 tournament when she lost to Rana Ismail of Egypt in straight games. Tong lifted the Asian individual title in 2021, becoming the second women from Hong Kong being crowned the regional champion after the success of now retired Annie Au Wing-chi in 2013. She secured her first title at the Top End Open in 2014 when she beat Lotte Eriksen in straight games. She also won the 2022 Tasmanian Open, wrapping up the year with two last 16 finishes at the New Zealand Open and Hong Kong Open. In early 2023, she made the last 16 of both the Cincinnati Gaynor Cup and the Squash On Fire Open, before reaching the Chestnut Hill Classic quarter-finals.