Williams said she won't play at either event after sustaining a back injury during the Australian Open.
She had left her name on the preliminary entry list for the BNP Paribas Open in Indian Wells, Calif., but withdrew Friday.
“After careful consideration, I will not return to the Indian Wells BNP Paribas Open this year," Williams said. "I send my best wishes to everyone involved in the tournament."
Notable deaths of 2014 [PHOTOS]