Mustard is a left-handed batsman and wicketkeeper, with a style likened to that of Australia's Adam Gilchrist.
He played for the Glenorchy Cricket Club, as well as helping and coaching young and upcoming players.
Subsequent replays revealed that the ball would have missed the stumps; however, Mustard's appeals to be allowed to continue were controversially turned down by umpire Ian Gould.
[5] Mustard had a quiet start to his debut tour, opening the batting and scoring 17 in a warm-up match against a Sri Lanka Cricket XI.
Though falling early in the first, Mustard scored a rapid 40 from 24 balls in the second,[10] and kept wicket in a manner that Jonathan Agnew described as "slick and unfussy.
Mustard retired from Gloucestershire after the 2018 season, and signed to play Twenty20 cricket for minor county Northumberland.