After their late equalizer at the Santiago Bernabeu on Tuesday, the Rojiblancos need only a scoreless draw at the Vicente Calderon to claim their first trophy of the season.
The Colombia international, who arrived from Monaco last month, opened his account for the European champion as it was denied late in a 1-1 first-leg draw at the Santiago Bernabeu on Tuesday.
James applied the finish to a scrappy buildup 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.
"I'm happy because it is a day I had dreamed of," he said. "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."
MORE: Ronaldo ice bucket challenge | Pitch invader's free kick | WAGs
Fellow first-leg scorer Garcia has his own designs on lifting the trophy, though, and says he and his teammates fully intend to do so in front of their own fans.
"Another match, at home," he said. "[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 Real also came out on top when the clubs clashed in the Copa del Rey — winning 5-0 on aggregate in the semifinals before beating Barcelona in the final.
However, Atletico had the edge in La Liga, taking four points off Real on its way to winning the title.
Real, which has already lifted the UEFA Super Cup during preseason, will have concerns over the fitness of Cristiano Ronaldo, who had to be substituted at halftime in the first leg because of a leg injury, but coach Carlo Ancelotti 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 Wednesday.