Argentina's former tennis player Gabriela Sabatini (R) and Czech-US former tennis champion Martina Navratilova return the ball to Argentina's Paola Suarez and Patricia Tarabini during their charity tennis exhibition, at the Lawn Tennis Club, in Buenos Aires, on March 14, 2009. The exhibition is organized by the Myasthenia Gravis Foundation (FAIAM) of Argentina, to raise awareness and funds to search for a cure of the illness. Getty Images logo Getty Images 8 months ago

Argentina's former tennis player Gabriela Sabatini (R) and Czech-US former tennis champion Martina Navratilova return the ball to Argentina's Paola Suarez and Patricia Tarabini during their charity tennis exhibition, at the Lawn Tennis Club, in Buenos Aires, on March 14, 2009. The exhibition is organized by the Myasthenia Gravis Foundation (FAIAM) of Argentina, to raise awareness and funds to search for a cure of the illness.