Whilst living in Scotland, Mercer was a member of the Glasgow Warriors academy.[4] In 2015, Mercer joined Bath.[5]
In September 2016, Mercer made his club debut in a Premiership fixture against the Newcastle Falcons.[1]
In February 2021 it was confirmed that Mercer would join French Top 14 side Montpellier ahead of the 2021–22 season.[6] Mercer's single season in Montpellier was a success, with the side winning their first ever French Championship.[7] Mercer also won some personal accolades, being named in the Top 14 Team of the Year and well as winning the Top 14 Player of the Year award.[8][9]
On 30 August 2022, it was confirmed that Mercer would return to England to re-join the Premiership Rugby with Gloucester on a long-term deal ahead of the 2023–24 season.[10]
International career
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