Steffi Graf
- Serena Williams
- Serena
- U.S. Open
- U.S. Open quarterfinals
- Williams Sisters
- prize money
- rematch
- wimbledon
- MM Leverage
- Maria Sharapova
- WTA
- Serena Slam
- Martin Morse
- Steffi Graf
- tennis
- #usopen
- Venus Williams
- Venus
by Stacey Tisdale
- USTA
- blacks and money
- pay gap
- Maria Sharapova
- tennis
- Serena Slam
- Serena Williams
- Martin Morse
- U.S. Open
- Steffi Graf
- women and money
- U.S. Open 2015
- MM Group
- Floyd Mayweather
- Roger Federer
by Stacey Tisdale
