The 15th-ranked Nalbandian, a former semifinalist, was recovering from hip surgery and the 90th-ranked Ancic was battling mononucleosis.
Ivan Navarro of Spain and Karol Beck of Slovakia will replace Nalbandian and Ancic in the main draw of the Grand Slam tournament that runs from Aug. 31 to Sept. 13.
Cadiz capture TristanDavydenko rallies to advance to 2nd round