April Ross, left, and Kerri Walsh-JenningsMenKey dates:&nbsp;Group play begins Aug. 6; gold-medal game is Aug. 18Venue:&nbsp;Copacabana Stadium.Big story:&nbsp;After getting silver in 2012, will Brazil&rsquo;s Alison Cerutti claim his first gold on home soil with partner Bruno Schmidt, or can Brazil&rsquo;s other top team, Pedro Solberg and Evandro Goncalves, spoil the party?Top U.S. prospects:&nbsp;Phil Dalhausser won a gold medal with Todd Rogers in 2008. He and Nick Lucena are third in the FIVB Olympic rankings. Jake Gibb and Casey Patterson are sixth.Others to watch:&nbsp;Outside of the Brazilians and Americans, the Netherlands has a pair of teams in the top five, Alexander Brouwer-Robert Meeuwsen and Reinder Nummerdor-Christiaan Varenhorst.Little-known fact:&nbsp;Schmidt&rsquo;s uncle&nbsp;Oscar&nbsp;is an accomplished international basketball player and was inducted into the Basketball Hall of Fame in 2013.WomenKey dates:&nbsp;Group play begins Aug. 6; gold-medal game is Aug. 17.Venue:&nbsp;Copacabana Stadium.Big story:&nbsp;Misty May-Treanor, who won the last three gold medals with Kerri Walsh-Jennings, is retired, meaning a new team will take home the gold in Rio for the first time since 2000.Top U.S. prospects:&nbsp;Walsh is still playing, this time with partner April Ross, and the duo is ranked No. 3 in the FIVB Olympic rankings. The other American team, Lauren Fendrick and Brooke Sweat, will be a long&nbsp;shot.Others to watch:&nbsp;Brazil has a pair of teams with a legitimate shot of winning the gold medal on its home turf. Larissa Franca and Talita Antunes are No. 1 in the Olympic rankings while Agatha Bednarczuk and Barbara Seixas are No. 2.Little-known fact:&nbsp;Ross, now partnered with Walsh, lost with Jennifer Kessy in the gold-medal match&nbsp;to Walsh and May-Treanor at the London Olympics.