Double world champion Daniel Wiffen is safely through to the final of the 800m freestyle after winning his heat.
In the fourth and final heat, Ireland swimmer Wiffen settled into the race in third position behind the Australian pair of Elijah Winnington and Samuel Short.
The 23-year-old edged past Short at the halfway mark, and made his move on Winnington with 300m remaining.
His time of 7:41.53 meant he was the fastest qualifier for the final, which takes place on Tuesday at 20:00 BST.
Earlier in the pool, Danielle Hill produced a strong swim to finish in fourth place in her heat and sneak into the semi-finals in 16th position.
In the first event of the day, Ireland’s Ellen Walshe produced a stunning final leg to go from seventh to fourth and qualify for the 400m individual medley final the in seventh overall.