HOUSTON, June 19 : Viktor Gyokeres and Alexander Isak have the potential to be among the best strike partnerships at the World Cup, but Sweden have to play to their strengths, coach Graham Potter said ahead of their clash with the Netherlands on Saturday. The Swedes thumped Tunisia 5-1 in their opening Group F fixture with both Gyokeres and Isak on the scoresheet in an outstanding display, but Potter warns the Dutch are a level higher than the North Africans and pose a different challenge. "We