Sweet Swede tennis player Bjorn Borg is best known for his 11 Grand Slam singles titles — and now fans can get to know him more, um, intimately. Bjorn Borg the apparel brand opens its American flagship concept store in SoHo this week — and right now it’s chock-full of crazy, colorful underpants. Stop by, pick up rainbow boy briefs, gobble fistfuls of Swedish candy, play mini-tennis and look for love in all the right places — namely the bjornborg.com dating site. I think we’re in lust. Bjorn Borg: 89 Crosby St.; 212-625-2334.