Durban - Myles Brown has continued with his sizzling form at the South African National Championships in Durban breaking the 800 metre freestyle record on Thursday.
The 22-year-old broke Troyden Prinsloo's record, set in 2009, by posting a time of 7:53.97, smashing the old record by a second.
This comes four days after he also improved Ryk Neethling's national mark in the 400m freestyle that has been standing since 1999.
In the process, Brown also qualified in his third individual event for the FINA World Long Course Championships after he met the standard in the 200m and 400m freestyle earlier in the championships.
"I wasn’t sure that I was still within the time of the record - it was a bit unexpected for me," Brown said.
"For all the previous races getting the qualifying time on Monday really took the pressure off.
"I am definitely going to go out for the 100 free but I will focus more on the 200m free as I am stronger in that event."
Olympic gold medallist Chad le Clos qualified for his second individual event of the championships, clocking a time of 1:56.13 in the 200m butterfly, his specialist event.
He was followed by Sebastien Rousseau, who qualified for the same event the day before.
Rousseau posted a time of 1:57.20 with Michael Meyer bagging the bronze in 1: 59.52.
Although this launched Le Clos into the top-10 in the world rankings, he was not happy with his performances at nationals.
"To be honest this has been my worst SA Nationals, I really didn't do as well as I wanted to," Le Close said.
"I am pleased [that] I won, I struggled the last 50m of the race.
"After nationals I will train hard to get back into my form.
"For Kazan my focus will be 100m and 200m fly."
Meanwhile, women's swimming ace Karin Prinsloo claimed the 200m backstroke in a time of 2:00.30 with Marlies Ross following her in 2:02.92.
Tara Nicholas won the women's 50m breaststroke posting a time of 32.04 seconds.
Tatjana Schoenmaker bagged the silver medal in 32.45 as Franko Jonker took third in 32.55.
Day 5 morning heats start at 09:30, with finals taking place at 18:00.
2015 FINA World Championships Qualifiers:
Myles Brown - 200m & 400m freestyle & 800m freestyle
Cameron van der Burgh - 100m breaststroke
Chad le Clos - 200m freestyle & 200m butterfly
Sebastien Rousseau - 200m butterfly