He won the Dunedin men's open singles title last month and on Tuesday collected the Champion of Champions men's singles title with a 21-14 win against former leading Otago amateur golfer Brett McEwan.
While the final score suggests the match was reasonably comfortable, it was actually a comfort stop which perhaps proved decisive for Purdon.
The scored was locked at 10-10 after 14 ends. Purdon took a brief break to go to the bathroom and returned a different player.
''Someone said to me afterwards, 'What did you do in there because you seem to be a much better bowler?''' Purdon said.
''Maybe it was just the break but mentally I just sort of tuned in a bit better.''
Purdon's win in the Dunedin open means he has qualified for the regional singles finals at the Taieri Bowling Club next week.
Win that and he will qualify for the nationals, although Purdon is still getting his head around his new identity as a singles player.
''I haven't usually been a singles bowler but this year it has all come together since Christmas,'' he said.
The 57-year-old took up the sport in the late 1980s but had a break while his family was young. He made a return about six years ago.
''I sort of prefer being in a team environment. The singles is very much a lonely game.
''But just mentally things have clicked for some reason.
''I guess I've embraced singles this year, whereas in the past I've found it more of a chore.''
Purdon has nine centre titles but his greatest claim to fame is a second placing in the national pairs with Mike Kernaghan ''back in the '90s''. They also paired up to win some invitational tournaments.
