Earlier in the pool on Tuesday, Anna Hopkin and Richards qualified for the semi-finals of their respective 100m freestyle events.
Hopkin was fourth in her heat with a time of 53.67 seconds, behind Australia’s Mollie O’Callaghan and Shayna Jack, and home favourite Beryl Gastaldello.
Her time was good enough to qualify in 10th position for the semi-finals, which take place from 20:30 BST.
In the men’s 100m freestyle, Welsh swimmer Richards, who missed out on gold in the men’s 200m freestyle by just 0.02secs on Monday, progressed in 13th place in a time of 48.40.
Richards will return to action at 19:30 BST for his semi-final.
However, there was disappointment for Jacob Whittle, who missed out on progressing by 0.6secs.
Also on Tuesday night, Daniel Wiffen will look to become the first Olympic gold medallist from Northern Ireland in 36 years when he competes for Ireland in the men’s 800m freestyle final at 20:05 BST.
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