Mallory won the singles title at the U.S. Championships a record eight times in fifteen attempts, with the last of her titles occurring at age 42 in 1926. Her worst finish there was a quarterfinal loss in 1927 at age 43. In 1926, Mallory hit one of the heights of her career when she came back from 0–4 in the third set of the final against Elizabeth Ryan, saving a match point in winning her eighth championship. Her farewell to the U.S. Championships was as a 45-year-old semifinalist in 1929, losing to Helen Wills Moody 6–0, 6–0 after having defeated the first foreign seeded player Betty Nuthall in the quarterfinal. Mallory is the only woman other than Chris Evert to have won the U.S. Championships four consecutive times.