Nagasu began training with Wong in October of 2006. Subsequently, they enjoyed great professional success. Nagasu won the U.S. junior ladies title in 2007, followed by the senior ladies win the next season."Charlene and I have been through a lot together," Nagasu said. "She's always been there for me, and has been a huge part of my journey to this point."
The 16-year-old California native struggled most of the 2008-09 season, suffering from an injured ankle and a growth spurt (Nagasu grew from 4'11 to 5'3). She finished fifth (Skate America) and eighth (NHK Trophy) at her Grand Prix assignments and was a disappointing fifth at the 2009 AT&T U.S. Figure Skating Championships.