US Open-Psychology of Match Points

Elina Svitolina, of Ukraine, reacts during a match against Anastasia Pavlyuchenkova, of Russia, during the second round of the U.S. Open tennis championships on Thursday in New York. (AP Photo/Manu Fernandez)

John Isner, of the United States, reacts as he congratulates Michael Mmoh, of the United States, after losing to Mmoh in the second round of the U.S. Open tennis championships on Thursday in New York. (AP Photo/John Minchillo)

Daniil Medvedev, of Russia, reacts during a match against Christopher O’Connell, of Australia, at the second round of the U.S. Open tennis championships, Friday, Sept. 1, 2023, in New York. (AP Photo/Frank Franklin II)

NEW YORK (AP) — One point from defeat against John Isner at the U.S. Open, Michael Mmoh faced a decision tennis players deal with all the time, whether on a public court or a Grand Slam stage: Swing away and go for broke? Or play it safe?