The American carried over his strong play from the third round of the ZOZO Championship to dominate for a six-stroke victory over Beau Hossler and Eric...
Mikumu Horikawa is one shot off the pace at the ZOZO Championship, while 2021 Masters champion Hideki Matsuyama struggled in his opening round.
The local favorite made up for missing out at the inaugural tournament and the Olympics with a clutch performance on home soil.
Unheralded Austrian Sepp Straka takes the early lead with an Olympic-record 63 at Kasumigaseki Country Club.