After the market closes on Sept. 26, Nike (NYSE: NKE) will report its earnings for the first quarter of fiscal 2018, which ended at the end of May. For this earnings release, it will be important to listen to what management has to say about footwear sales trends in North America, where Adidas (NASDAQOTH: ADDYY) has been running circles around Nike. The dichotomy between these two companies’ performances is evident in their respective stock performances over the last year: Nike stock is down about 5%, while Adidas has climbed 44%.