The 18-year-old gymnast has learnt a lot competing against Biles. McCusker is now working towards making her Olympic debut with Team USA, alongside the four-time... Rio 2016 gold medallist, in Japan. But that's a prospect the World Champion is trying to say little about at the U.S. Gymnastics national championships in Kansas City, where Biles claimed a record-equalling sixth national all-around title.