After their late equaliser at the Santiago Bernabeu on Tuesday, Los Rojiblancos need only a 0-0 draw at the Estadio Vicente Calderon to claim their first trophy of the season
The Colombia international, who arrived from Monaco in July, opened his account for the European champions as they were denied late on in a 1-1 first-leg draw at the Santiago Bernabeu on Tuesday.
James applied the finish to a scrappy build-up to open the scoring in the 81st minute before Raul Garcia tapped home from a Koke corner to give Atletico the advantage on away goals.
And, while revealing his delight at getting off the mark for Los Blancos, James is determined to score a goal of even greater importance when the sides meet again at the Estadio Vicente Calderon on Friday.
"I'm happy because it is a day I had dreamed of," he told reporters. "I scored a goal but we wanted to win and that wasn't to be.
"The victory was within reach but now we have to go out to win in the Calderon. We have to be patient, look for spaces, pass the ball and try to score there. As a great team, we have to go out to win no matter what.
"Hopefully I can score again in the Calderon and try to help my team win there."
Fellow first-leg goalscorer Garcia has his own designs on lifting the trophy, though, and says that he and his team-mates fully intend to do so in front of their own fans.
"Another match, at home," he remarked. "[We're] very eager to play with our fans and win another title that we really want."
The encounter is a repeat of last season's Champions League final, which Real won 4-1 after extra-time.
The sides met five times in all competitions during the 2013-14 campaign and Carlo Ancelotti's men also came out on top when the clubs clashed in the Copa del Rey - running out 5-0 aggregate winners in the semi-finals before beating Barcelona in the final.
However, Atletico had the edge in La Liga, taking four points off their rivals on their way to winning the title.
Ancelotti's side, who have already lifted the Super Cup during pre-season, will have concerns over the fitness of Cristiano Ronaldo, who had to be substituted at half-time in the first leg due to a leg injury, but the coach has assured fans that the problem is not serious.
Luka Modric should be involved after putting pen to paper on a new four-year contract on Wednesday.