Roger Federer of Switzerland returns a shot against Juan Martin del Potro of Argentina during the final at the ABN AMRO tournament at the Ahoy Arena in Rotterdam, Netherlands, Sunday, Feb. 19, 2012. Federer won in two sets 6-1, 6-4. (AP Photo/Peter Dejong)

Associated Press
Roger Federer of Switzerland returns a shot against  Juan Martin del Potro of Argentina during the final at the ABN AMRO tournament at the Ahoy Arena in Rotterdam, Netherlands, Sunday, Feb. 19, 2012. Federer won in two sets 6-1, 6-4. (AP Photo/Peter Dejong)
Roger Federer of Switzerland returns a shot against Juan Martin del Potro of Argentina during the final at the ABN AMRO tournament at the Ahoy Arena in Rotterdam, Netherlands, Sunday, Feb. 19, 2012. Federer won in two sets 6-1, 6-4. (AP Photo/Peter Dejong)
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