Nike's intense rivalry with Adidas just escalated

The competition between Nike and Adidas is getting crazier. 
The largest sportswear maker was downgraded from "buy" to "hold" by Jefferies analysts in light of "intensifying US competition" from main competitor Adidas.
"The athletic footwear cycle and Nike brand power are strong, but the competitive landscape should make share gains and margin expansion elusive," CNBC reports, citing Jefferies research. 
Adidas has successfully avoided downward trends in the athletic shoe an