[1] He made his List A debut for Cricket Australia XI in the 2017–18 JLT One-Day Cup on 27 September 2017.
[2] In December 2017, he was named in Australia's squad for the 2018 Under-19 Cricket World Cup.
[3] Merlo was in the Cricket Australia XI squad for the 2017–18 JLT One-Day Cup.
[4] Merlo made his Twenty20 debut for Melbourne Stars in the 2018–19 Big Bash League season on 1 January 2019.
[5] He made his first-class debut on 24 February 2020, for Victoria in the 2019–20 Sheffield Shield season.