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Barry Chin/Globe StaffBy almost every statistical measure, Koji Uehara has been the best relief pitcher in the American League.
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Stephen Dunn/Getty Images/File 2006He got his start in college and worked his way to games like the World Baseball Classic in 2006.
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Koji Sasahara/AP/File 2002Former Red Sox outfielder Gabe Kapler played with Uehara for the Yomiuri Giants in 2005.
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Koichi Kamoshida/Getty Images/File 2006"He was the Greg Maddux of Japan, somebody with great control," said Kapler, now an analyst for Fox Sports 1.
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Shizuo Kambayashi/AP/File 2002Barry Bonds held his bat upside down after he was struck out by Uehara during the opening game of the Japan-US all-star baseball series.
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Shizuo Kambayashi/AP/File 2002Those experiences only added to Uehara's desire to play in the majors.
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Greg Fiume/Getty Images/File 2009Uehara came to Major League Baseball when he signed with the Baltimore Orioles.
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Rob Carr/Getty Images/File 2011"As a teammate, I think he was one of the best teammates I ever had," said Orioles center fielder Adam Jones.
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Ronald Martinez/Getty Images/File 2011Uehara was traded to the Texas Rangers. His wife and son live in Baltimore during the season and often for a few weeks after.
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Ronald Martinez/Getty Images/file 2011When the Red Sox offered him a one-year contract worth $4.25 million, he took it.
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Barry Chin/Globe Staff/fileOnly in recent weeks have the souvenir stands at Fenway Park sold T-shirts bearing his name and No. 19.
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JOHN TLUMACKI/GLOBE STAFFFor now, the only thing that matters to him is continuing this unprecedented run.
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Winslow Townson/Getty Images/File 2013"I can't lose focus on what I'm doing," he said. "I think about the next pitch, the next batter. That's it."