Overview
- Cerúndolo fell 3-6, 4-6, 6-4, 6-4, 6-2 in 3 hours 35 minutes on Court 5.
- His exit leaves Argentina without singles players at this US Open, and no Argentine man reached the second week at any major this season for the first time since 2015.
- Riedi, a qualifier ranked No. 435, had defeated Pedro Martínez in straight sets in the first round.
- Cerúndolo had saved his tournament with a five‑set comeback against Matteo Arnaldi in his opener and was chasing his first US Open third round.
- Riedi becomes the second lowest‑ranked man to make a Grand Slam third round this decade, following Jiri Vesely at the 2023 US Open.