Serena Williams (37)
POSITION 80 The tennis superstar is a sharp businesswoman too. Her company, Serena Ventures, invests mainly in start-ups founded by women and minorities, and is worth at least R151 million. She also has a selftitled and self-funded clothing line. She owns part of the Miami Dolphins American football team, and her R1,3 billion in career prize money is twice as much as any other female athlete.