American Sunisa Lee became the new Olympic women’s all-around champion Thursday, following the stunning departure of her fellow Team USA teammate from the competition. Lee scored 57.433 to finish ahead of Brazil’s Rebeca Andrade, who got second-place, and Russia’s Angelina Melnikova, who got third. Her victory extended the United States’ domination of the all-around event following Olympic gold medal champions Carly Patterson in 2004, Nastia Liukin in 2008, Gabby Douglas in 2012, and Simone Biles in 2016. “Coming into this competition I didn’t even think I could be competing for a gold medal,” Lee said afterward. “I was competing for...