Defending bronze medalist Italy beat the U.S. in four sets in their second preliminary stage of the men's volleyball tournament on Tuesday.
The teams traded opening sets before Italy won the third and fourth, both 25-23. Each team plays five times in pool play, with the top eight teams advancing to the quarterfinals.
The U.S. lost its Olympic opener in straight sets to Canada on Sunday night, 25-23, 25-17 and 25-23.
The No. 5-ranked Americans watched as the hard-hitting and 12th-ranked Canadians celebrated at Maracanazinho arena in the first pool-play match for both countries.
Tied 23-23 in the third set, Canada held on after ending the second set on a 10-2 run.
Eight of the 12 U.S. players are in their first Olympics.