 It's still the undoubted leader in market share terms. But in terms of the growth profile, Nike's performance can best be described as lackluster. Nike could win some shine back at the Olympics next month. LeBron James and Team USA will be shooting for gold with the Nike swoosh on their jerseys. It will be a very visible part of the Olympics. It always is. Problem is, those upstart brands will be marketing at the Games too. I'm Daniel Ackerman for Marketplace.