I'd say the 10k is about 4-5% slower than the 5k. For Chapa's time, that means somewhere between 13:33-13:42 for 5k. I think Chapa would be much more revered if more elite HSers had run the 10k, or if he had some All-Time marks in other more relateable events such as the 5k. As it is, most people probably just see him as a 8:5low two miler that holds a strange record not many have attempted before.
That's crazy if true that his 28:32 is equivalent to that in the 5,000. Then I don't think Ritz could've ran that. Maybe Lindgren if he had been racing against someone else. And obviously Lindgren is a top 2 HSer of all time. Crazy time by Chapa.
Didn't 13:37 Rupp try for the 10K HSR and not make it under 29? Or am I misremembering?
Yeah, Rupp ran 29:09.56 one week after his 5k record.
Also, Lindgren ran a pretty crazy 10k at his HS peak:
"July 25, Los Angeles, Saturday, -The mightiest roar of the crowd of 50,519 -Was when the 18-year-old high school student from Spokane, Wash., who ran two older Russian veterans to the ground in the 10,000-meters, in only his second try at 10k, winning in 29:17.6 (above). The early miles went: 4:37, 9:22 & 14:07. With 10 laps to go, Lindgren shot into the lead with with a blistering lap of 60.0 that brought him from 10 yards behind his Russian rivals to 10 yards in front. He kept lengthening the lead with every lap, winning by 150 yards or more over, the 26-year-old, Leonid Ivanov (Nikolai Dutov was 25 y/o). Lindgren was the first American ever to win a distance event at the U.S.-Soviet duel meet!"
That was an excerpt fromhttp://www.runningentertainment.com/runningshots21.html
, as you can see from above it wasn't the best way to run a fast time, but it was one hell of a run. That 60 second lap in the middle did the job of breaking the Soviets, but also hurt him as well (just less). 14:07 for the first three miles, coming back with a 15:10 to close isn't exactly ideal splits.
As you can read on that site, he ran 29:02 to win the Olympic Trials over Billy Miles that September (which is too late to be credited to his high school resume, but was that same season for him).
Yes, Chapa's 10k time is rather ridiculous.