Verhaas was in control of all three Masters finals which the late Paul Hunter won, and he describes them as his most memorable matches.

On 21 January 2007, he was the referee of the final of the Masters between Ronnie O'Sullivan and Ding Junhui, in which he ejected at least one fan from Wembley Arena for heckling the 19-year-old Chinese player.

After finding out that there was no special prize for completing a 147, O'Sullivan shook hands with opponent Mark King after potting the last pink.

This included several appearances at the Mosconi Cup and the initial Matchroom-organised 1999 World Professional Pool Championship, which was won by Efren Reyes.

He was elected as a board member of the World Professional Billiards and Snooker Association in 2016 but lost his bid for re-election three years later.