Cristiano Ronaldo is a defender's worst nightmare.And perhaps the same can be said for his team-mates too, after once forcing a Manchester United defender to report to the club doctor for "dizziness" after one performance.Ronaldo made his second debut for United last weekend against Newcastle United, scoring twice and earning himself the man of the match award.The Portugal forward arrived from Juventus for £20m on a two-year contract with an option to extend it for a further year.The 36-year-old is keen to replicate the good form of his first spell at Old Trafford between 2003 and 2009, where he scored 84 times in 196 league appearances.But before Ronaldo joined United in 2003 for £12.2m, Roy Keane told the story of how the forward's.
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