Ghanaian forward Latif Blessing played full 90 minute as his club Los Angeles FC won their first ever Major League Soccer game after a 1-0 victory over Seattle Sounders.
Former Arsenal striker Carlos Vela slipped a pass to Rossi and the Uruguayan clinically finished first time from 24 yards out.
Moments after his cross was headed off the inside of the post by Latif Blessing, Diego Rossi scored the first goal in LAFC history in the 11th minute.
It was the fastest goal scored by an expansion club 33 seconds quicker than Fredy Montero's strike in the Sounders' inaugural match, a 3-0 win over New York Red Bulls in 2009.
Meanwhile, the club owned by former Basketball player Magic Johnson are thrilled by the victory and former Egypt boss, Bob Bradley who manages the side expressed his satisfaction.
Magic Johnson tweeted after the game, "I'm so excited my @LAFC soccer team won our first MLS game 1-0 over Seattle," Johnson tweeted. "Congratulations to my partners, our manager Bob Bradley, players, and fans."
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LAFC will be the visitors at the Galaxy's StubHub Center in Carson on March 31 when the newest cross-town MLS rivalry opens.