 Somerset qualified for the T20 Blast finals day in 2018, with Waller taking 16 wickets in 16 games with an impressive economy rate of 6.78 runs per over.Waller also claimed his 100th wicket for the club in T20 cricket and becomes only the 2nd person to achieve this fear after Alfonzo Thomas.As of 2019 Waller is the 2nd leading all time wicket taker in Somerset T20 cricket history.