Jennifer Baybrook, 17, didn't miss a trick at the 1997 National Yo-Yo Contest in California. She became the first female U.S. yo-yo champion. "I put in a lot of hard work," Jennifer, a professional player since age 8, told TFK. She takes her yo-yo around the world and across the U.S. to demonstrations. Next year Jennifer will put some of her 300 tricks to the test at the world championship.