Serena Williams defeated her lifetime tennis rival on Saturday, April 6, 2013 in Charleston, S.C., big sister Venus Williams. She’s advanced to the  final of the Family Circle Cup. During an interview with ESPN, the younger Williams says she is so inspired by her sister and the way she is tackling her disease. Venus was diagnosed with Sjorgen’s syndrome, an autoimmune disorder.

A power packing server, Serena won her 14th straight match with a 6-1, 6-2 victory over Venus.

Check out the video interview.