“Daniel’s definitely the one to beat,” said the 23-year-old Denny.
“The guy is pushing the world record so if he puts half-decent throws together he’s beating everyone.
“I just want to compete, do my best for myself and what the other boys do is what happens.
“If I put it together in the right moment then who knows what’s possible.”
Denny did the rare hammer-discus double at the 2018 Commonwealth Games, finishing second in the hammer and fourth in the discus.
But he knew something had to give if he was to maximise his chance of a medal in Doha and at next year’s Tokyo Olympics.
“Now that I’ve dropped the hammer it’s funny even thinking about it,” he said.
“I look back and even thinking about it right now I don’t know how I did it that double. It was so jam-packed.
“To do what I did was pretty ridiculous.
“I do miss it but I’m glad I made the decision to focus on discus because I’ve got more time for the goals I want to meet.”
Ellie Pashley (31 minutes 18.19 seconds) and Sinead Diver (31:25.49) were 13th and 14th respectively in a women’s 10,000m final won by flying Dutchwoman Sifan Hassan in 30:17.62.
Hassan now has to decide whether to also contest the 1500m or the 5000m in Doha.
Gold Coast Commonwealth Games bronze medallist Luke Mathews and fellow Australian Peter Bol were both eliminated in the opening round of the men’s 800m.
Mathews was way off the pace in the first of the six heats, trailing home in second-last spot in one minute 50.16 seconds, a full second off his personal best.
Bol clocked 1:46.92.
Kenyan Emmanuel Korir led the qualifiers into the semi-finals on Sunday in 1:45.16.
Morgan Mitchell was last in her women’s 800m semi-final.
Mitchell’s time of 2:04.76 was more than two and a half seconds slower than her opening round on Friday.