The news is good from the Agassi family, PEOPLE reports in its new issue. One year ago, tennis star Andre Agassi's sister Tami, 31, was diagnosed with breast cancer and subsequently underwent a double mastectomy and received chemotherapy. Then, in August, their mother, Elizabeth, received similar news from her doctor and underwent a mastectomy. But last month physicians gave a clean bill of health to both women. Tami, a former tennis player at Texas A&M, has begun working out and has even hit a few balls with her brother's girlfriend, Steffi Graf, reports PEOPLE. She plans to have reconstructive surgery this year before hosting a tennis fund-raising event -- to be headlined by Andre, says the magazine -- for cancer research at the University of Washington Medical Center in Seattle, where she lives.