Backstroker Corey Main has qualified for his second semi-final at the Rio Olympics and Bradlee Ashby will also get a night swim after making the cut for the 200m individual medley.
The 21-year-old Main clocked another personal best to post the 15th-fastest time in the heats of the 200m.
While Ashby, 20, came within a whisker of his national record to book the last spot in the 16-man semi-final on Wednesday night.
Main's time of 1 minute 57.51 seconds in his favoured event allowed him to finish sixth in his heat and book another visit to the night finals in the Olympic Aquatics Stadium.
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"I came home strong and felt good. I did a PB so I'm happy. I need to do big PB tonight but I am up for it," he said.
Russian Evgeny Rylov was quickest in the heats with a time of 1:53.02. Florida-based Main took 0.28sec off his previous best and is now just 0.36sec shy of Gareth Kean's national record.
Main also made the semi-finals of the 100m and ended 15th overall. Ashby was seventh in his heat won by US legend Michael Phelps with a time of 1:59.77 and was just 0.01sec outside his NZ mark.
He snuck into the last 16 by just 0.03sec.
American great Ryan Lochte was fastest qualifier with 1:57.38.