Criteria (Version #1: 12th Mar)
2.1. Swimmers must be placed first or second in the final of the event at SA National Aquatic Championships.
2.2. Swimmers showing performance progression improvement from Heats to Semis to Finals may be considered for selection.
2.3. All swimmers must be available for relay selection.
Criteria (Version #2: 20th Mar)
2.1. Athletes must participate in the final of the event at the 2018 SA National Aquatic Championships.