He won the 2017 Northern Territory PGA Championship and the 2022 Yeangder TPC, as well as recording a runner-up finish at the 2022 International Series England.

He beat Will Zalatoris in the round of 16 to advance to the final eight, but lost 1 down in the quarterfinal to eventual champion Doc Redman.

[6] Smyth recorded his best Asian Tour finish at the time, at the inaugural International Series England in June 2022.

He finished runner-up in the team event at LIV London the following week together with Peter Uihlein, Richard Bland and Phachara Khongwatmai to collect US$525,000.

He started 2023 with a tie for 6th at the PIF Saudi International and a solo 3rd at the World City Championship at the Hong Kong Golf Club.