Top-seeded Alexander Zverev scraped into the second round of the US Open on Tuesday, beating 89th-ranked Lorenzo Sonego 6-4, 3-6, 6-7 (7/9), 7-5, 6-4. Rain delays meant some matches were suspended while others were postponed. Key points and original sources are listed below.

• Top-seeded Alexander Zverev scraped into the second round of the US Open on Tuesday, beating 89th-ranked Lorenzo Sonego 6-4, 3-6, 6-7 (7/9), 7-5, 6-4. Zverev fought off a determined challenge from Sonego in a tense all-court battle spiced by unlikely retrieval...S1

• Rain delays meant some matches were suspended while others were postponed.S2

• Top-seeded Alexander Zverev scraped into the second round of the US Open on Tuesday, beating 89th-ranked Lorenzo Sonego 6-4, 3-6, 6-7 (7/9), 7-5, 6-4.S3