Commentators frequently joke that Sui—a balance beam and floor specialist—has the ability to make the four-inch wide beam magically expand. She moves across it with speed, rhythm and absolute confidence. Her elegant lines helped her capture the gold on beam at last year’s World Championships by a massive 0.5 points, and so far in London she has seemed unshakable on that apparatus. Floor was a different story. Despite being reigning world silver medalist on that event, she finished a disappointing 13th in qualification and will sit out that final.