The American will retire after the U.S. Open.
The No. 1 seed was playing his first singles match since losing to Dustin Brown in the second round of Wimbledon.
The left-handed Bellucci dominated on serve against the 21-year-old Belgian Kimmer Coppejans.
The world No. 10 returned to competitive play for the first time since his second-round loss at Wimbledon.
The former No. 1 is hoping for a more organized structure to help rising Americans.
The tours' working summer vacation continues with six events this week.
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Forty years after one of the biggest upsets in tennis, a look back at the men that made the match.
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