It wasn't just any victory though, it was essentially the title decider and Madrid went to Barca's home and took the trophy. And over the past 5-6 meetings between the 2 sides Madrid have shown they're capable of matching them. Their last 3 meetings = 1 RM win, 1 Barca win, 1 draw. Also, when they met in the Copa del rey last season, Barca just edged it 4-3 agg.