Impressive Age-group swimmer Sophia Batchelor headed qualifiers for the 100m butterfly, the event in which she holds the national record.
The Christchurch swimmer clocked 1:01.46 in the heats yesterday morning, with the fastest four swimmers within half a second as they chase the qualifying time of 58.70.
Tauranga's Nathan Capp, a member of Swimming New Zealand's high performance centre, was fastest in the 400m individual medley in 4:27.72 ahead of North Shore's Roy Pearce (4:31.97) and Howick Pakuranga's Carsten Corazza (4:32.32).
Talented Matamata swimmer Matthew Stanley impressed with a strong performance in the 400m freestyle heats. Stanley, also a member of the high performance squad, clocked 3:53.55 in a good swim, just over three seconds outside the qualifying mark and more than five seconds clear of the next fastest.
Southland's Natalie Wiegersma set herself up for a qualifying crack with a solid effort in the heats of the 400m individual medley, dominating the event yesterday morning.
In non-Olympic events, Danielle Koni was fastest in the 50m backstroke ahead of North Shore clubmate Melissa Ingram while Australian-based Paul Benson led a Roskill Magic trifecta ahead of Nielsen Varoy and Corney Swanepoel in heats of the 50m butterfly.