Nadal , still recovering from appendix surgery he underwent in November , has a tough first - round match against former top 10 - player Mikhail Youzhny of Russia .
Wawrinka will begin his title defence against Marsel Ilhan of Turkey .
Nadal , still recovering from appendix surgery he underwent in November , has a tough first - round match against former top 10 - player Mikhail Youzhny of Russia , while Wawrinka will begin his title defence against Marsel Ilhan of Turkey .