The Sedins began the 2003–04 season on a line with first-year player Jason King. The trio were dubbed the "Mattress Line" (two twins and a King) and formed the Canucks' second scoring line until King was reassigned to the team's minor league affiliate midway through the season. Daniel was awarded his first penalty shot on 17 January 2004, in a game against the Mighty Ducks of Anaheim. He was stopped by goaltender Jean-Sébastien Giguère as Anaheim went on to win the game 2–1. On 24 February 2004, Daniel recorded his first NHL career hat-trick with a four-goal effort in a 4–2 win over the Detroit Red Wings. Over 82 games, Daniel increased his production to 18 goals and 54 points. The Canucks won the Northwest Division title in the regular season, before losing to the Calgary Flames in the first round of the playoffs. Daniel recorded a goal and two assists in the seven-game series.