Japan and the Netherlands have both qualified for the semifinals in San Francisco on March 17-18. Tuesday's game was to decide the pool winner and runner-up.
"Getting eight runs like that early was huge," Japan manager Koji Yamamoto said. "It was good to see Abe hitting like that because we rely on him in big games."
Andrelton Simmons led off the game with a solo homer to left but the lead didn't last long. Abe tied it with a solo homer to right off Netherlands starter David Bergman.
After an RBI single by Nobuhiro Matsuda, Hisayoshi Chono hit a bases-loaded double that gave Japan a 5-1 lead. Abe then connected for a three-run homer to give Japan an 8-1 lead.
"It's been a while since I hit two in one inning," said Abe, the captain of Japan's team. "We had a lot of support from our fans here and now we're going over there to win it all."
Japan starter Kenji Otonari earned the win after giving up one run on one hit while striking out six over three innings.
After scoring two runs in the seventh, the Netherlands closed the gap to 8-6 in the eighth. Hainley Statia scored on a groundout to short, Kalian Sams hit an RBI single to center and Quintin De Cuba hit a single to right that scored Sams from third.
Chono drove in two runs in the eighth with a single to left and Kazuhisa Makita retired the side to close out the game.
Japan, with no players from Major League Baseball rosters, went 5-1 in the first two rounds, losing only to Cuba.