He faded a little coming home as the Australian turned up the wick to win by 28/100ths of a second.
Open water medallist Isaac Foote, the Masterton swimmer now coached by Gary Hurring at the Wellington Regional HPC, grabbed his third bronze finishing the 400m freestyle in 4:01.69 just ahead of teammate Troy Balvert (Waves, Dunedin).
Medley specialist Carsten Corassa (Howick Pakuranga) led the way with a strong third leg of 51.94s to push the New Zealand quartet with Ewan Jackson, Cameron Simpson and Crosland to a silver behind Australia in the 4x100m freestyle relay.
The championships conclude tonight.
Results:
50m breaststroke: Amini Fonua (TON) 28.80, 1; Nikolas Pregelj (AUS) 29.29, 2; Nicholas Schafer (AUS) 29.74, 3. Also: Matthew Glassford (NZL) 30.72, 5;
400m freestyle: Declan Potts (AUS) 3:55.23, 1; Trent Grimsey (AUS) 4:01.68, 2; Isaac Foote (NZL) 4:01.69, 3; Troy Balvert (NZL) 4:08.80, 4.
200m backstroke: Ben Edmonds (AUS) 2:03.12, 1; Kurt Crosland (NZL) 2:03.40, 2; Ben Gillies (NZL) 2:04.90, 3.
Men 4x100m freestyle relay: Australia 3:24.71, 1; New Zealand 3:31.92, 2 (Ewan Jackson 53.33, Kurt Crosland 54.51, Carsten Corassa 51.94, Cameron Simpson 52.14); France 3:35.87, 3.