June 5 vs Yakult at Jingu Stadium – Uebayashi homered in his fourth straight game. The NPB record of seven was set by Sadaharu Oh and Randy Bass. The Hawks franchise record of six was set by Nobuhiko Matsunaka in 2004.
June 29 vs Lotte at YafuOku Dome – Uebayashi recorded the first walk-off hit of his career. Down 5-4 in the bottom of the ninth, with runners on first and third and two out, Uebayashi hit a walk-off triple to left-center off Tatsuya Uchi.
Source: Sports Hochi 6/29/2018
October 7 vs Lotte at ZOZO Marine – Uebayashi hit a triple to left-center in the fourth inning and became the first player to record fourteen triples in one season since Larry Raines hit sixteen in 1953.
October 21 vs Seibu at MetLife Dome (Climax Series Final Stage) – Uebayashi recorded ten RBI and became the fifth player in Playoff and Climax Series history to collect ten or more RBI. The other four: Alex Cabrera (thirteen in 2004), Jose Fernandez (eleven in 2004), Terrmel Sledge (ten in 2009), Alfredo Despaigne (ten in 2018). He joined Sledge as the only players to record ten RBI in on stage.
Uebayashi recorded three triples in the Final Stage. He became the first player to hit three triples during one post-season.
January 1 – Uebayashi is interested in the Majors and would like to ultimately earn and exercise his international free agent option (some time during the 2025 season).
Source: Nikkan Sports 1/1/2018