Princess Amalia had the honor of officially opening the championships. © Getty Images Mary looked stunning in the brown polka dot dressMary completed her look with metallic bronze peep-toe heels, stacked bracelets and a coordinating clutch. The future Dutch queen looked radiant in a white midi dress decorated with bold emerald-green vertical stripes. Mary's warm caramel palette and classic polka dots delivered the timeless sophistication that has made the Danish queen one of Europe's most consistently elegant royal dressers. © WireImage The elegant dress looked so stylish on the Danish royalAmalia's graphic stripes, meanwhile, felt younger and more contemporary without losing the polish expected of a future queen.