Did anyone see this:
"One high-profile exception took place last year. Christian Taylor of the United States, who won the triple jump at the 2012 Olympics and signed with Nike in 2015, was permitted to wear Adidas shoes at the world track and field championships in Beijing while Nike customized shoes for him. Taylor, the triple jump favorite at this year’s Olympics, now wears Nikes."
I wonder if that's why Taylor isn't doing very well this year. I looked up the stats.
Last year (wearing adidas), Taylor's best jump was 59' 9". This year (wearing Nike's), his best jump is just 58' 4".