Croatia's Mario Ancic has withdrawn from Wimbledon because of an illness.
Ancic has already missed several events this year
Earlier this year, the 23-year-old, am All-England Club semi-finalist in 2004, was diagnosed with glandular fever.
He has been replaced in the draw by Canadian Frank Dancevic.
China's Na Li has withdrawn from the women's draw with a rib injury and will be replaced by Alize Cornet of France.
Earlier this week,struggling ex-French Open champion Gaston Gaudio pulled out.
His withdrawal as preceded by that of former Wimbledon semi-finalist Xavier Malisse at the weekend.
Jurgen Melzer, Paradorn Srichaphan and Jose Acasuso have already pulled out of the third grand slam event of the year.
Russia's Anastasia Myskina, the 2004 French Open champion, is also out, as is compatriot and world number 19 Vera Zvonareva, who has a wrist injury.