TOKYO (AP) — This is the Shohei Ohtani effect. Ohtani put on a giant show in batting practice hours before he hit a grand slam in the second inning — in the first he doubled on the first pitch of the game but didn’t score — as Japan hammered Taiwan 13-0 in Pool C at the World Baseball Classic.

The rosters for all 20 teams playing in the World Baseball Classic were revealed Thursday ahead of the start of the tournament on March 5. Now it’s time to speculate on how managers will navigate those rosters to set starting lineups and pitching staffs.

The powerhouse United States team seemed in peril of a stunning upset when it trailed Great Britain 1-0 in the fifth inning in Saturday night's World Baseball Classic pool play contest. However, in that home half of the fifth,