Stomach issues hit Casper Ruud, Tommy Paul, Holger Rune on day where Acapulco's top five seeds all bow out

The 20-year-old American seeking his first ATP Tour title beat the Australian Millman, 7-5, 7-6 (3), and will be joined in the round of 16 by Kevin Anderson. The South African was a 6-4, 6-4 winner over American Sam Querrey earlier Monday.

Grigor Dmitrov, ranked 28th in the world, tested positive for COVID-19 and had to withdraw from the first major pro tennis event in the Dallas area in three decades.

Dmitrov was supposed to play doubles with John Isner, who lives about a mile from the SMU indoor tennis facility hosting the event.

Isner, ranked 26th, played a first-round doubles match Monday night with fellow American Jack Sock. They beat Aleksandr Nedovyesov and Aisam-Ul-Haq Qureshi, 7-6 (3), 6-4.

Anderson won for the first time in 2022 and improved to 9-8 against Querrey. He will play Isner in the round of 16.

American Taylor Fritz is the highest-ranked player in the field at No. 19.

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