During the 2012
Thomas Cup quarter-final, he was defeated by
Lin Dan from
China, but not before he brought it into a rubber game of 21–17, 9–21 and 5–21. His best performance was during the
Yonex French Open, where he won his first
Super Series title on 28 October 2012 after beating
Viktor Axelsen from
Denmark with the scores of 21–18 and 21–17. In March 2022, Liew was appointed as
Lee Zii Jia's assistant coach. Since January 2023, Liew has been carrying on his duty as Lee's part-time coach following the departure of Lee's coach,
Indra Wijaya in November 2022. On 26 April 2023, Liew confirmed his retirement from professional badminton and would pay attention in coaching
Lee Zii Jia. On 20 December 2024, Liew was given a 12-month suspension from all badminton-related activities by
BWF for betting and match-fixing. On 30 December 2025, coach
Yeoh Kay Bin departed from Team Lee Zii Jia (LZJ) after a challenging 2025 season marked by Lee's injuries and limited competitiveness, Liew then returned as a coach after completing the suspension ended on 20 December 2025, making Liew the chosen replacement to fill the coaching vacancy. == Achievements ==