A few notes from around the boxing world:
• Former two-time welterweight titlist Andre Berto's opponent is set for his Sept. 6 ring return in Cincinnati. Berto, coming back from a 14-month injury-related layoff, will face Steve Upsher Chambers in a 10-rounder at a maximum weight of 149 pounds. The fight will open a Showtime tripleheader that also includes junior welterweight Adrien Broner facing Emanuel Taylor in the main event and junior welterweight Lucas Matthysse against Roberto Ortiz in the co-feature.
Berto (28-3, 22 KOs), of Winter Haven, Florida, who turns 31 the day after the fight, is trying to end a two-fight losing streak and return from major shoulder surgery to repair an injury he suffered in a 12th-round knockout loss to Jesus Soto Karass in July 2013. Upsher Chambers (24-3-1, 6 KOs), 29, of Philadelphia, has also lost two fights in a row, an eight-round decision to former welterweight titlist Luis Collazo (whom Berto holds a close win against) and a fourth-round knockout to prospect Eddie Gomez.
• Former lightweight titlist Antonio DeMarco (30-3-1, 23 KOs), now campaigning at a junior welterweight, returns to action against Lanardo Tyner (31-10-2, 20 KOs) in a scheduled 10-rounder on Saturday night (beIN Sports Espanol, 11 ET) in Tecate, Mexico. DeMarco, 28, of Mexico, is looking for his third win in a row since losing his lightweight belt by eighth-round knockout to Adrien Broner in November 2012. Tyner, 39, of Detroit, took the fight on just a few days' notice. He has lost two fights in a row, both by decision.
• Last Saturday's Showtime card was not a hit with viewers. The tripleheader from Carson, California, averaged just 514,000 viewers, down 11 percent from the network's average audience for the year (578,000) for "Showtime Championship Boxing." Kell Brook's decision against Shawn Porter to win a welterweight title in the main event averaged 661,000 viewers, 26 percent below Porter's last fight in April (also on Showtime). That bout, against Paulie Malignaggi, averaged 897,000 viewers. Anthony Dirrell's decision over Sakio Bika to win a super middleweight title in a rematch in the co-feature averaged 574,000 viewers, which was up 29 percent from the 446,000 viewers drawn by their December first fight on Showtime. The opener between lightweight titlist Omar Figueroa Jr. and Daniel Estrada averaged 341,000 viewers, down 37 percent from the 545,000 viewers Figueroa's last fight on Showtime, against Jerry Belmontes, drew in April.