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Since 2012 Pagunsan has played primarily on the Japan Golf Tour. His first win on the tour came at the 2021 Gateway to The Open Mizuno Open, having previously had a number of runner-up finishes, including the 2012 Japan Open Golf Championship, the 2013 and 2014 Indonesia PGA Championship, the 2014 Gateway to the Open Mizuno Open, the 2017 SMBC Singapore Open, the 2019 Shigeo Nagashima Invitational Sega Sammy Cup and the 2021 Asia-Pacific Diamond Cup Golf.