What?
I don't think this is true.
Sorry. After doing some research it seems Federer has won this very same Masters tournament a total of 5 times whereas Nadal has only won it twice.
2011 - Djokovic def. Nadal 7-5 6-4
2010 - Nadal def. Federer 6-4 7-6
2009 - Federer def. Nadal 6-4 6-4
Before 2009, the same Masters Series was held in Hamburg in the same style of clay court
2008 - Nadal def. Federer 7-5 6-7 6-3
2007 - Federer def. Nadal 2-6 6-2 6-0 [lol]
2006 - Robredo def. Stepanek 6-1 6-3 6-3
2005 - Federer def. Gasquet 6-3 7-5 7-6
2004 - Federer def. Coria 4-6 6-4 6-2 6-3
2003 - Coria def. Calleri 6-3 6-4 6-4
2002 - Federer def. Safin 6-1 6-3 6-4
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