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Photo Credit: Kathleen Malone-Van Dyke -
Photo Credit: Kathleen Malone-Van Dyke -
Photo Credit: Kathleen Malone-Van Dyke -
Photo Credit: Kathleen Malone-Van Dyke -
Photo Credit: Kathleen Malone-Van Dyke -
Photo Credit: Kathleen Malone-Van Dyke -
Photo Credit: Kathleen Malone-Van Dyke -
Photo Credit: Kathleen Malone-Van Dyke -
Photo Credit: Kathleen Malone-Van Dyke -
Photo Credit: Kathleen Malone-Van Dyke -
Photo Credit: Kathleen Malone-Van Dyke -
Photo Credit: Kathleen Malone-Van Dyke -
Photo Credit: Kathleen Malone-Van Dyke -
Photo Credit: Kathleen Malone-Van Dyke -
Photo Credit: Kathleen Malone-Van Dyke -
Photo Credit: Kathleen Malone-Van Dyke -
Photo Credit: Kathleen Malone-Van Dyke -
Photo Credit: Kathleen Malone-Van Dyke -
Photo Credit: Kathleen Malone-Van Dyke -
Photo Credit: Kathleen Malone-Van Dyke -
Photo Credit: Kathleen Malone-Van Dyke
Serena Williams and sister Venus squared off Tuesday, Sept. 8, 2015 in the quarterfinals of the 2015 U.S. Open at the USTA Billie Jean King National Tennis Center.