Day 1 of the 2023 Zozo Championship ended with Collin Morikawa in the lead. The 26-year-old American golfer posted a bogey-free 64 to take his sixth career 18-hole lead/co-lead on the circuit. Morikawa's 64 is also his third at the Accordia Golf Narashino Country Club in Chiba.While Morikawa took the solo lead, there was a five-way for T2. Despite being in strong contention throughout Day 1, Mikumu Horikawa, one of 14 Japanese players on the field, settled for T2 after posting 65. Tour’s Special Temporary Member Nicolai Hojgaard also sat T2, marking his highest position on the American circuit after Round 1.The duo joined the likes of Robby Shelton, Eric Cole and Emiliano Grillo in the leaderboard. Zac Blair sat solo-seventh, while event favorite Xander Schauffele sat T8 alongside Joel Dahmen, Satoshi Kodaira, Sahith Theegala, Sungjae Im, Will Gordon, Cam Davis and Andrew Novak.Zozo Championship Defending champion Keegan Bradley also shared the position.2023 Zozo Championship leaderboardHere is the complete round 1 leaderboard for the Zozo Championship in Japan:1: C. Morikawa -6T2: R. Shelton -5T2: M. Horikawa -5T2: E. Cole -5T2: N. Højgaard -5T2: E. Grillo -57: Z. Blair -4T8: S. Kodaira -3T8: J. Dahmen -3T8: X. Schauffele -3T8: W. Gordon -3T8: S. Theegala -3T8: S.J. Im -3T8: C. Davis -3T8: K. Bradley -3T8: A. Novak -3T17: A. Baddeley -2T17: R. Ishikawa -2T17: K.H. Lee -2T17: J. Lower -2T17: J. Suh -2T17: Y.H. Song -2T17: B. Hossler -2T17: T. Hoge -2T17: N. Taylor -2T26: H. Hall -1T26: Y. Inamori -1T26: M. Wallace -1T26: C. Champ -1T26: K. Mitchell -1T26: T. Kanaya -1T26: C.A. Yu -1T26: S.H. Kim -1T26: R. Hisatsune -1T26: J. J. Spaun -1T26: H. Matsuyama -1T26: M.W. Lee -1T26: T. Montgomery -1T26: R. Nagano -1T40: C. Tarren ET40: D. Lingmerth ET40: M. Hughes ET40: L. Hodges ET40: A. Scott ET40: M. NeSmith ET40: M. Hubbard ET40: S. Imahira ET40: B. Griffin ET40: K. Onishi ET40: D. Riley ET40: M. Kim ET40: D. Lipsky ET53: T. Semikawa 1T53: A. Bhatia 1T53: K. Kitayama 1T53: T. Moore 1T53: K. Hirata 1T53: H. Buckley 1T53: N. Hardy 1T53: R. Fowler 1T61: B. Wu 2T61: N. Lashley 2T61: S. Stevens 2T61: V. Norman 2T61: S. Ryder 2T61: D. Wu 2T67: A. Schenk 3T67: A. Svensson 3T67: A. Eckroat 3T67: A. Iwasaki 3T67: A. Rai 3T67: T. Alexander 3T67: A. Norén 3T67: B. Taylor 3T67: K. Nakajima 3T76: T. Detry 4T76: T. Werbylo 478: G. Higgo 12After a successful 18-hole outing, the 78 PGA Tour players will go again on Friday for the $1,530,000 prize money from the $8.5 million Zozo Championship prize purse.