japan j1 leagueWhen are the Japan J1 League Predictions available? You can track down our J1 League tips and predictions on this page, predictions are posted 4 days before any J1 League event. UsingJapan J1 League 2025 facts (last 90 games). Home team wins in average 47% of the games played at home. Number of draws on J1 League 2025.