McEvoy upsets Magnussen in Australian 100m Games trial
Australian swimmer Cameron McEvoy is pictured in Sydney on February 22, 2013 - by William West
Magnussen (47.92 seconds) admitted his preoccupation with breaking the 100m world record brought him unstuck as McEvoy completed the 100-200m freestyle double in a personal best time of 47.65secs.
While McEvoy was ecstatic, Magnussen could not hide his frustration at losing out on the national title to his freestyle relay teammate.
"I will put that down to a learning experience," Magnussen said.
"I just got stuck into the mind set of chasing a world record again.
"It brought me unstuck. I will go back to training and re-think that.
"I think I self-destructed a little."
Magnussen looked in ominous form when he clocked his fifth sub-48 second time in the 100m semis.
His 47.83 semis effort was not far outside the time that won him the 2013 world title (47.71).
It only added to pre-meet speculation from new Australian head coach Jacco Verhaeren that his charge may break Brazilian Cesar Cielo's 46.91secs world record in Friday's 100m final.
Magnussen still earned a Glasgow Games team selection but he believed he had plenty of work ahead of him.
"I just went about the race the wrong way," he said. "There's no big prize for winning a national title. Here I am focusing on time."
McEvoy shaved 0.23secs off his personal best time in winning the final.
"I did shock myself. He's been racing awesome all season. You waste energy if you focus on what others are going to do," 19-year-old McEvoy said, who got the winning break on Magnussen with a slick turn at the 50m.