After the Mariners posted a modest 200 against the ladder leaders, Diamanti skittled the Tigers top order, taking 4-4 inside five overs late on the first day.
Among the ex-Mariners skipper�s wickets were Chris Brabazon, Stevie Eskinazi and Nick Hobson to complete a hat-trick across two overs.
Diamanti said challenging conditions and a negative mindset from the Tigers were the main reasons for his spectacular success. Diamanti has been a big reason behind the rise of Rockingham-Mandurah this season, with the Mariners emerging from 15th last season to third midway through the competition.
Diamanti has now taken 16 wickets this season, rising to eighth on the wicket taker list.
Former state player Mark Atkinson has taken the reins as Mariners coach and has made an immediate impact with the young playing group.
Diamanti, also a former Mariners coach, believes developing the younger players is the main reason behind continuing to play, with his high performance programs a driving force at the club.
�I don�t have any personal goals for my own game at my age,� Diamanti said.
�I am still enjoying the game but working with our younger players with some elite programs has been great for me in a coaching point of view.�
He believes success is on the horizon for the young squad, who have cemented themselves as a premiership contenders.
Diamanti is no stranger to success after a glittering first class career for Central Districts in New Zealand, before making his debut for the Black Caps in 2009 in the Chappell-Hadlee series against Australia.