Capriati defeated Elena Dementieva of Russia, 6-2, 7-5, in a match interrupted several times by rain.
After arriving at the USTA National Tennis Center at 10 a.m. EDT, the sixth-seeded American had just 72 minutes of actual court time, although the met took eight hours to complete as rain fell intermittently throughout the day.
The day session was wiped out by rain, which is expected to fall most of the week. Three sessions were rained out over Labor Day weekend last year.
With action scheduled to begin at 11 a.m., light drizzle held up play until about 1:20 p.m. EDT, when Capriati and Dementieva started their match.
Workers dried the court around 3:20 p.m, but the rain returned.