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Championship leader Nico Rosberg believes that Red Bull racer Daniel Ricciardo is a genuine threat in the 2014 title race.
Rosberg's collision with Mercedes team-mate Lewis Hamilton at the Belgian Grand Prix cleared the way for Ricciardo to collect his third win of the campaign and close to within 64 points of Rosberg.
The German believes that he needs to be wary of his rival ahead of this weekend's Italian Grand Prix.
"Ricciardo's win in Belgium saw him close the gap to Lewis and I in the drivers' standings," Rosberg wrote in his Sportsmail column.
"He is doing a great job this season and he is a serious rival for title so we must keep a close eye on...
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