In 2019, when Liu was 13 years old, she became the youngest US Figure Skating Champion. The previous youngest US Figure Skating Champion was Tara Lipinski. Lipinski was 14 years old when she claimed the title back in 1997.
Best of all, Lipinski, who's now a commentator for NBC, was at the championship in 2019, so she got to watch Liu break her record in real time.