A pair of 18-year-olds gave Tottenham Hotspur fans reason to believe in a bright future on Wednesday as Lucas Bergvall and Archie Gray shone in a 1-0 victory over Liverpool in the first leg of the League Cup semifinal. “Name me another Premier League team that’s got two 18-year-olds and one playing out of position consistently,” Postecoglou told reporters. “I’m …