They’ve been there through the highs and lows, so this one’s for them. It’s just so special to win in front of them and to have them here supporting me, it’s just amazing.
Smith, who was bidding for his first win on home soil, had to settle for a share of second with New Zealand’s Josh Geary, who posted a final-round 67 to match Smith’s closing 69 and finish at 12 under.
Leishman, the 2019 champion, birdied three of the last four holes to post a 68 and finish in a tie for fourth alongside Matthew Millar, while Min Woo Lee, the 2020 winner, struggled to a closing 76 to end the week in a share of 13th.
Smylie’s victory earned him a two-year exemption on the DP World Tour and a spot in next year’s Open Championship at St Andrews.