In last season's final which Barcelona won 5-2, he scored the fifth goal and scored twice against Athletic Bilbao in the semi final. He has scored 7 goals for the Catalans in LaLiga and scored twice when he last played against Real Madrid which they won 4-3 in last season's home fixture in LaLiga. Therefore, I fancy the Brazilian to score tonight.
Real Madrid beat Atletico 2-1 in the previous round and their previous cup match saw them win 3-2 against lowly Telavera 3-2 in the Copa Del Rey. Barcelona scored 5 past Athletic Bilbao in the previous round and though they had a 2-0 win in Copa Del Rey against Guadalajara, their last 2 meetings against Real Madrid in Cup meetings have been full of goals. The Cope Del Rey final ended 2-2 and the final last season of this cup ended with 7 goals, so I expect at least 4 goals tonight.