World No. 4 Hideki Matsuyama said Wednesday he had to think twice but gratefully accepted a surprise request to play golf with Prime Minister Shinzo Abe and U.S. President Donald Trump next month.

Speaking to reporters in Shanghai a day before the WGC-HSBC Champions gets under way at the Sheshan International Golf Club, Matsuyama said he felt undeserving when first contacted but decided it would be a "once-in-a-lifetime" opportunity he should not miss.

"I wasn't sure if I'd be good enough," Matsuyama said. "But I hope to have fun so that it will be engraved in my memory. I'll do my best not to lose (against Trump)."