The SA men’s 4x200m freestyle relay quartet made up for the team’s failure to qualify for the 4x100m final by smashing the national record.
Myles Brown, Leith Shankland, Calvyn Justus and Sebastien Rousseau combined to clock an impressive time of 6:58.03 in the heats, breaking the 10-year-old national mark (7:18.94) by more than 20 seconds.
They qualified sixth fastest for the final.
Meanwhile, Rousseau was third quickest in the first round of the 400m individual medley, touching the wall in 4:02.71 as he coasted through to the final as one of the medal favourites in the evening session.
The national 4x50m medley relay quartet, consisting of Chad le Clos, Cameron van der Burgh, Charl Crous and Luke Pendock, also progressed the final, qualifying sixth fastest (1:34.31) in the morning heats.
Le Clos, who won gold in the 200m freestyle on Wednesday, and Van der Burgh were set to compete in the 100m butterfly and breaststroke finals respectively, after coasting through the preliminary rounds on the opening day.