 On June 23, 2017, Oshie signed an eight-year, $46 million contract with an annual average of $5.75 million to remain with the Capitals.Oshie saw his production drop to 18 goals and 47 points in 72 games in 2017-18, but would play a crucial role in the Capitals 2018 Stanley Cup victory, scoring 8 goals (including 6 on the powerplay) and 21 points in 24 playoff games.On June 7, 2018, the Capitals defeated the first-year expansion Vegas Golden Knights in Game 5 of the 2018 Stanley Cup Final for their first Stanley Cup in franchise history.