michel ndahinduka has been knocked out. the 13th time in a decade that the grand champ champion will end the season without a title. mark graham reports. >> reporter: now ranked eighth in the world. michel ndahinduka's form has been far from best. he wobbled. fabio fognini took the match thursday, into the early hours on friday. prevailing in five sets. >> if you want to play against him and if you want to do something different, you have to risk. >> it's not the matter that i lost. if i had opportunities, he wins. so i accept it, not happy that he played better than i did, but that is what happened. >> while rafael nadal's form continues to slump. the world number one novak djokovic advanced comfortably through to the fourth. the 2011 us open champion beat andreas seppi in under two hours. >> satisfied, but you can always do better. i think. we are all perfectionists in a way and we always see certain things that we could have done better. >> women's world number one serena williams dropped her first set of the tournament