It’s earnings season and one underdog looking worthy of a wager is Under Armour Inc. But if you’re going to bet on ‘da bulls continuing to move UAA stock up the field on the price chart; a bull call spread remains in the starting line-up. Let me explain.For UAA stock bulls — and bears for that matter — it’s almost officially game time once again. The athletics retailer is set to announce earnings next Tuesday on May 1 in front of the opening bell. Last quarter, investors jumped aggressively into shares following the company’s mixed, but in our view, mostly better-than-expected or feared quarterly results. SourceMore upside is possible due to stochastics. $UAA, Under Armour, Inc. / D