Day five and round two of Olympic boxing kicks off at 8:30 a.m. EDT this morning, and Team USA is in action from the get-go. In the first fight of the day, top-rated bantamweight Lazaro Alvarez of Cuba faces Joseph Diaz Jr of the United States. And there are big matchups all day.

You can watch live (close to anyway) on NBCOlympics.com, or wait for tape delay on CNBC at 5 p.m. EDT.

[ London 2012 Boxing: Round of 32 Recap ]
[ Full London 2012 Boxing Coverage ]

Also in action this morning...

Bantamweight: Sergey Vodopiyanov (Russia) faces Robenilson Vieira (Brazil), with the winner taking on the Alvarez-Diaz winner in the quarterfinals. The second set of bantamweight fights feature John Joe Nevin (Ireland) vs Kanat Abutalipo (Kazakhstan), and Oscar Valdez (Mexico) facing seeded Anvar Yunusov (Tajikistan).

Heavyweight: American Michael Hunter Jr faces Russia's Artur Beterbiev at 9:30 a.m. EDT. The winner has to face top-ranked Oleksandr Usyk of Ukraine.

Super Heavyweight: Dominic Breazeale of Team USA fights about 10:30 a.m. EDT against Russia's Magomed Omarov, who won the European Championships in 2011.

Bantamweight (123 lbs/56kg)

8:30 a.m. - Lazaro Alvarez (Cuba) vs Joseph Diaz Jr (United States)
8:45 a.m. - Sergey Vodopiyanov (Russia) vs Robenilson Vieira (Brazil)

9:00 a.m. - John Joe Nevin (Ireland) vs Kanat Abutalipov (Kazakhstan)
9:15 a.m. - Oscar Valdez (Mexico) vs Anvar Yunusov (Tajikistan)

Heavyweight (201 lbs/91kg)

9:30 a.m. - Artur Beterbiev (Russia) vs Michael Hunter Jr (United States)
Winner will face Oleksandr Usyk (Ukraine), who has a bye.

9:45 a.m. - Tervel Pulev (Bulgaria) vs Xuanxuan Wang (China)
10:00 a.m. - Yamil Peralta Jara (Argentina) vs Chouaib Bouloudinats (Algeria)

Super Heavyweight (201+ lbs/91+kg)

10:15 a.m. - Magomedrasul Medzhidov (Azerbaijan) vs Meji Mwanba (Democratic Republic of the Congo)
10:30 a.m. - Magomed Omarov (Russia) vs Dominic Breazeale (United States)

10:45 a.m. - Mohammed Arjaoui (Morocco) vs Blaise Yemou Mendouo (Cameroon)
11:00 a.m. - Ytalo Perea Castillo (Ecuador) vs Roberto Cammarelle (Italy)