Thong joined Fortec Motorsports squad to race in the Protyre Formula Renault Championship in 2013 and secured one pole position and oen fastest lap in the final round held in Silverstone.
Thong also made his debut in the third round of Asian Le Mans Series in Zhuhai and won the overall and LMP2 class with OAK Racing in a Morgan / Judd LMP2 prototype.
He later move to the main class featuring the Dallara F312 Chassis with Team West-Tec and finished the season with several top 10 results in his debut year in Formula 3.
Thong and Phoenix Racing (Germany) entered the championship with the 2016 Audi R8 LMS GT3 and secured two wins and one pole position during the season with only three points shy from the overall title.
Same year Thong also returned to the 24 Hours Nürburgring with the same lineup featuring Cheng Congfu, Marchy Lee and Alex Yoong with the New Audi R8 LMS GT3.
Thong remained with Phoenix Racing (Germany) to participate in the inaugural season of the Blancpain GT Series Asia and scored two victories in Suzuka, Japan and Shanghai, China respectively.
The year started with Thong joining fellow Hong Kong Drivers Marchy Lee, Darryl O'Young, Adderly Fong and Charles Kwan for the Dubai 24 Hour in a brand new Audi R8 LMS GT4 with Phoenix Racing (Germany).
The #82 car led by Thong finished two times on the podium at the 3 Hours of Sugo and the 5 Hours of Autopolis before Thong and Yoong withdrew from the remaining two races of the championship to join Phoenix Racing (Germany) with two Brand New Bentley Continental GT3 at the final two rounds of Blancpain GT Series Asia, partnering South African driver Jordan Pepper.
The Hong Kong driver returned to the Dubai 24 Hour with KC Motorgroup using a New Spec 2018 Nissan GT-R GT3 pairing with Tsugio Matsuda, Katsumasa Chiyo, Josh Burdon and Andrea Gagliardini.
Thong made his debut in Japan's premier championship 2019 with Hong Kong outfit X Works Racing with a 2018 Nissan GT-R GT3.
The team was equipped with Yokohama tires and finished four times in the points in their debut year at Round.2 Fuji Speedway, Round.4 Buriram Thailand, Round.7 Sugo and Round.8 Twin Ring Motegi.
Thong made his Asian Le Mans Series return but this time with brand new team K2 Uchino in the premier LMP2 class running the Oreca 07/Gibson.
Thong had several teammates throughout the season including 2005 GT300 Champion Kota Sasaki, Takuro Shinohara and Takeshi Kimura due to COVID-19 travel restrictions which led to Alex Au, Thong's planned teammate from Hong Kong being unable to enter Japan due to the closure of the Japanese border after the pandemic.
Thong returned to the championship with new formed Japanese team Hirix Good Day Racing with a 2020 Mercedes AMG GT3 EVO with Daisuke Yamawaki and 2019 2019 GT300 champion Shinichi Takagi.
The #888 Hirix Racing AMG GT3 EVO came home as the 2020 Fuji Super Tec 24 Hours winner after completing 528 laps in total.
The following round at Okayama International Circuit saw the crew suffered from their only DNF of the season when Shinichi Takagi crashed on lap 9 of the 3 Hours of Okayama which left him a fractured back and wrist, resulting in Takagi withdrawing from the remaining races in both Super Taikyu Series and Super GT the same year.
Thong and his Hirix Racing team took the checkered flag fourth after suffering from a driver through penalty due to start infringement by his teammate.
The final round at Suzuka was cancelled due to the announcement of the Japan state of Emergency due to the increasing COVID-19 cases around the country, hence only the first five rounds would be counted and from then onwards Thong and the #888 Hirix Good Day Racing crew as announced as the 2020 Super Taikyu Series Champion after securing two wins, another podium finish and a pole position.