O2 Arena is a multi-purpose arena, in Prague, Czech Republic. It is home to HC Sparta Prague of the Czech Extraliga and is the second-largest ice hockey arena in Europe. It has hosted important sporting events such as the European Athletics Indoor Championships, two Ice Hockey World Championships (2004, 2015), the Euroleague Final Four 2006, the World Floorball Championship, the Davis Cup finals, as well as a handful of NHL and KHL games, including the 2014 Gagarin Cup final.