The current Nottinghamshire captain cemented his place at the top of the order in 2016 with a quickfire hundred at Trent Bridge.
Despite a greenish tinge to the wicket suggesting conditions were far from ideal, the right-hander hit 113 from 114 balls, making light work of the loss of his opening partner Greg Smith inside the first seven overs.
It was merely the continuation of a purple patch for Mullaney, who had aleady reached three figures earlier that week when he scored 139 against Cambridge MCCU.
And his 42 in the second innings were equally crucial to securing a three-wicket win after Surrey were invited to follow on.
Watch the best of the action above.