Formula 4 Leong tested in a Formula 4 car when he was thirteen. Since then, he has gained a passion for single-seater racing.
Formula 4 Chinese Championship 2016 In 2016, when Leong was fourteen, he geared up for his first race in Formula 4 by joining the
2016 F4 Chinese Championship with
Asia Racing Team. Leong entered 2 rounds of the championship. At
Goldenport Park Circuit, Leong took the pole position in race 1. He would finish fourth and fifth in races 1 and 2 respectively, but retired in race 3. In the
Shanghai International Circuit round, he would finish third, first, and sixth in races 1, 2, and 3 respectively, and set the fastest lap in race 2. Leong would be illegible to score points as he was under the age of fifteen. Leong is the 15th youngest F4 race winner.
Macau Formula 4 Race In the 70th
Macau Grand Prix, Leong participated in the first weekend’s
Macau Formula 4 Race which was an invitational round of the
2023 Formula 4 South East Asia Championship, with SJM
Theodore Prema Racing. It was Leong’s first race in the
Tatuus F4-T421. Leong qualified fourth, behind
Hadrien David. Wet conditions were encountered during the qualifying race, which Leong was able to finish third due to David’s non-classification. Positive momentum continued in the final race, which Leong finished second, behind his teammate
Arvid Lindblad.
Lamborghini Super Trofeo Asia In 2024, Leong made his first appearance with
Miki Koyama in the
Lamborghini Super Trofeo Asia with
SJM Iron Lynx Theodore Racing. Leong completed the season as the first runner-up in the Pro class. He returned to the series in 2025 for
SJM Theodore Racing, with Alex Denning as his teammate, and claimed the Pro title one round early. ==Karting record==