World Cup stars Kroos and Rodriguez were making their Real debuts, while Bale was returning to his hometown, but it was Ronaldo, characteristically, who hogged the spotlight with a brace in the Welsh capital yesterday.
The Portugal captain claimed a 30th-minute opener from Bale's cross and then slammed home a second goal shortly after half-time to earn the European champions what could be the first of six trophies this season.
"We knew this would be a complex game, but we played well and created goal-scoring opportunities," said Ronaldo, who was named man of the match by his former Manchester United mentor Alex Ferguson.
While 80-million-euro (USD 108 million) new recruit Rodriguez had a modest debut, Madrid's new-look attack -- which cost roughly 310 million euros to assemble -- showed ominous flashes of quality.
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Victory gave Madrid only their second Super Cup, after a maiden triumph in 2002, and enabled Carlo Ancelotti's side to avenge a costly 2-1 loss at the hands of Europa League winners Sevilla in La Liga last season.
While Ancelotti named both Kroos and Rodriguez in his starting XI, Sevilla left-back Alberto Moreno was omitted from his side's match-day squad amid reports he is on the verge of joining Liverpool.
Bale and then Ronaldo, with a free-kick, saw efforts deflected narrowly off-target, before Bale's outside-of-the-foot volley from a Rodriguez left-wing cross was blocked by a defender.