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The first day of men's water polo at the Summer Olympics are over and the big surprise was that three-time defending Olympic champion Hungary lost their first match in over 12 years as they fell to Serbia 14-10. The United States got off to a good start as they narrowly defeated Montenegro 8-7.
Here are the rest of the results from the first day of action:
• Croatia defeated Greece 8-6
• Spain defeated Kazakhstan 14-6
• Italy defeated Australia 8-5
• Romania defeated Great Britain 13-4
Here are the standings after Day 1:
| Group A | Group B |
| 1. Italy (1-0) | 1. United States (1-0) |
| 1. Spain (1-0) | 1. Romania (1-0) |
| 1. Croatia (1-0) | 1. Serbia (1-0) |
| 4. Greece (0-1) | 4. Great Britain (0-1) |
| 4. Kazakhstan (0-1) | 4. Hungary (0-1) |
| 4. Australia (0-1) | 4. Montenegro (0-1) |