Igor Sijsling upsets Mikhail Youzhny in first round of ABN Amro

Igor Sijsling, a wild card, served nine aces to nil against seventh-seeded Mikhail Youzhny, the 2007 champion and 2010 runner-up.
Koen van Weel/AFP/Getty Images

Defending champion Juan Martin del Potro and Wimbledon winner Andy Murray make their first appearances on Wednesday.

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