One of the most celebrated records in Australian athletics is under increasing threat after Peter Bol and Joe Deng finished first and second in the 800m at the Diamond League meet in Stockholm.
Rio Olympian Bol claimed the victory in one minute 44.56 seconds, narrowly ahead of training partner Deng (1:44.61), with the personal best efforts moving them to fourth and fifth spots respectively on the national all-time list.
The Australian record of 1:44.40 was set by Ralph Doubell on his way to the gold medal at the 1968 Mexico City Olympics, a mark equalled by Alex Rowe in Monto Carlo 46 years later.
After controversially getting the nod over Jeff Riseley to contest the two-lap race at the Gold Coast Commonwealth Games, Deng justified the selectors' faith by finishing seventh.
The race in Stockholm was the second time this month that Deng had gone under the 1:45 barrier.
But it was still not quite enough to claim the win against Bol, who did not even qualify for the Gold Coast Commonwealth Games in an event where Australia has enviable depth.
Bol and Deng will again target the national record at a meet in Tubingen, Germany on Saturday, while Deng will get another crack at the Paris Diamond League meet on June 30.
Australian Commonwealth Games silver medallist Henry Frayne had the best seat in the house as Cuban teen sensation Juan Miguel Echevarria produced the biggest long jump anywhere in the world in 23 years.
Echevarria soared out to 8.83m in the final round in the Swedish capital, although the 2.1m per second tailwind was just outside the legal mark of 2m - making the jump illegal for record purposes.
"Today I wanted over 8.50m but I didn't think I could jump so far," said Echevarria.
"The pressure on me was good today and it was good competing against the top guys.
"I want to jump at this level for a long time."
Frayne was seventh with 8.04m.
New Australian record holder Linden Hall was eighth in the women's 1500m in 4:02.89.
Fellow Australian Jordy Williamsz finished second in the men's 1500m - a non-Diamond League event - in 3:38.30 behind Norway's Jakob Ingebrigtsen.