The NHL pulled out of the Olympics for the 2018 competition in a dispute over insurance and the IOC's ambush marketing restrictions, prohibiting the national teams from inviting any player it held under contract. The American team was put at a particular disadvantage, as more than 31% of NHL players are Americans (in comparison, only 4.1% are Russians). As a result, the U.S. had to enter the tournament with a hastily assembled team of free agents, players from European leagues, AHLers on one-way contracts, and college players. The team proved unsuccessful, losing to Slovenia and the Olympic Athletes from Russia in the preliminary round, and being eliminated by the Czechs in the quarterfinals. The OAR team benefited most from NHL's absence and ultimately won the tournament with a team that was composed primarily of SKA Saint Petersburg and HC CSKA Moscow players from the Russia-based KHL and featured ex-NHL all-stars Pavel Datsyuk, Ilya Kovalchuk and Vyacheslav Voynov (all SKA).