Martina Navratilova plans to hit tennis balls off the top of Africa's highest peak. The tennis legend is climbing Tanzania's 19,340 foot- (5,895-meter) mountain next week to raise money and awareness for the Laureus Sport for Good Foundation. Navratilova, 54, has never climbed higher than 12,000 feet (3,660 meters) before, but lives in Aspen, Colorado, so is somewhat used to altitude. More...