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Jakob Ingebrigtsen will also contest the men's 5,000m in Tokyo
ByHarry Poole
BBC Sport in Tokyo
Jakob Ingebrigtsen described his performance as "terrible" after he suffered a shock exit in the men's 1500m heats at the World Athletics Championships in Tokyo.
The world outdoor title is the only international 1500m gold medal missing from the Norwegian star's collection after he was beaten by Great Britain's Josh Kerr and Jake Wightman at the past two editions.
But the 24-year-old will not have the chance to end that wait inside the stadium where he triumphed in the Olympic 1500m four years ago after finishing eighth in his heat on Sunday.
Ingebrigtsen, a two-time Olympic and world champion, has endured an injury-disrupted season and did not race for six months prior to these championships.
"I was terrible," Ingebrigtsen told BBC Sport.
"The race itself was perfect, especially how it turned out, it was gifted to me.
"Unfortunately I have lost too much and I have not been able to prepare.
"Of course I'm disappointed but it's a reality check that it was never really going to happen. I was holding on for dear life because I love to compete.
"I've been glued to the floor unfortunately. I've not been able to do what is needed, clearly. I just have to look forward."
Britons Kerr, Wightman and Neil Gourley progressed - and saw their medal hopes boosted further as Frenchman Azeddine Habz and talented Kenyan teenager Phanuel Koech, the top two fastest 1500m runners this year, both also exited the competition.
The men's 1500m semi-finals take place on Monday (13:30 BST), with the final on Wednesday.
While Ingebrigtsen began the season by breaking the world indoor 1500m and mile records in the same race in February, and won 1500m and 3,000m golds at the World Indoor Championships one month later, an Achilles issue has prevented him from competing since.
Ingebrigtsen described that period as "pitch dark" before the championships, speaking to Norwegian broadcaster NRK.
"I have taken the trip down to the injury cellar several times this spring. It has been pitch dark there," he said.
"This is more or less the worst case scenario for me because I have had to sit home and watch the whole season go by."
Away from the track, the trial of Ingebrigtsen's father took place earlier this year, with Gjert Ingebrigtsen cleared of abusing his son but found guilty of violence against his daughter, Ingrid.
Ingebrigtsen will return for the 5,000m heats on Friday - the event in which he has won the past three global titles and believes he is currently better placed to succeed in.