Investing.com - Economists at investment bank Goldman Sachs (NYSE:GS) are now forecasting a World Cup final between Brazil and England on July 15, after updating their predictive model.Goldman upgraded its expectations for the England team following their decisive six-one win against Panama on Sunday. It was their biggest ever World Cup victory.Goldman used machine learning to simulate one million variations and pick a winner ahead of the tournament.The model initially forecast a final between Brazil and Germany, with Brazil expected to win.With the first round of the World Cup drawing to a close, Goldman updated its model based on performances to date.Brazil, who beat Costa Rica two-zero on Friday, is still forecast to win the overall competition.Goldman warned that the winning margins are becoming wafer thin as the tournament heats up, especially for England.“This is reflected in the winning probabilities, which capture a sense of how easy the path to the final will be for each country.” Goldman said.