Agbayani's double helped the Marines erase a 1-0 deficit and improve to a perfect 3-0 in the four-nation tourney.
"It was a well-played game," Marines manager Bobby Valentine, said.
"I was very impressed with China and our team played very well."
The Chinese all-stars, who dropped to 0-3, are managed by former major league manager Jim Lefebvre. Lefebvre and Valentine both played for the Los Angeles Dodgers in the 1960s.
The inaugural Konami Cup features the top professional teams from Japan, South Korea, Taiwan as well as a team of all-stars from China's pro league.
Valentine went with a lineup that included mostly younger players who didn't play in the Japan Series.
"I wanted to give some of our younger players a chance to get some experience in a big game," Valentine said.
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