"Jeter played a big role in all of this," Matsui said, according to The Associated Press. "The kids had a magnificent day. Hopefully, when they go back to their everyday lives tomorrow, they'll have new dreams to sustain them."
Jeter and Matsui conducted a youth baseball clinic and then managed middle school teams in a three-inning contest that was won, 2-0, by Matsui's squad.
The event also featured a home run derby between U.S. and Japanese students. According to the AP, Matsui thrilled the fans when he hit a towering homer over the right field wall at the Tokyo Dome, where he spent 10 seasons with the Yomiuri Giants.
Back at Yankees camp, pitcher CC Sabathia -- one of four remaining players from the 2009 World Series championship team -- had predicted that Matsui would defeat Jeter in the home run hitting competition.
"Matsui, easy," Sabathia said. "He's a power hitter, it's what he does. I've just seen his BP. Jeet takes some good BP, too, but I think Matsui swings for it. His swing was just classic for launching balls."
During his visit, Jeter also took in a sumo tournament and visited Matsui's hometown.
"It was a wonderful few days," Jeter told the AP. "Hideki showed me around, I got a chance to go see his hometown, I got a chance to see sumo wrestling and to top it off, today was this great charity event. I'm grateful Hideki invited me and it's all for a great cause."
Bryan Hoch is a reporter for MLB.com. Follow him on Twitter @bryanhoch and read his MLBlog, Bombers Beat. This story was not subject to the approval of Major League Baseball or its clubs.