Since 2007 all Grand Slam tournaments have offered equal prize money for male and female tennis players. Although men and women are paid equally in Grand Slams they still play a different number of best-of sets -men play best-of-five set matches while women play best-of-three set matches. Those two competing circumstances created a financial gap in prize money paid to women and men for the unit of effort in a tennis play -for a game. The present paper estimates this financial gap for 2016 Grand Slam tournaments. Moreover, it demonstrates the nominal magnitude of this gap and its effect on year-to-year increasing prize money that are paid to winners. The results showed that women on average obtained 60% more prize money for a game played than men in all four 2016 Grand Slams.