With Nike Inc going full throttle to redeem itself from its recent rut, sell-side analysts have relegated Under Armour Inc to the backbench.Earning Estimates Keep Coming DownOppenheimer analysts Anna Andreeva and Samantha Lanman noted that Under Armour continues to lag, as earnings estimates keep coming down. Given that the apparel segment is maturing, the analysts believe all hinges on footwear.The firm believes the Street earnings estimate for the first quarter of 17 percent growth could be optimistic, given the fading footwear momentum and tougher comparisons.The Street's optimism may have stemmed from expectations of improvements in hockey stick sales starting in the second quarter of 2017, and new distributions by Kohl's Corporation , which started in February, and DSW Inc. , which would start this back-to-school season.Read more