India, Feb. 22 -- England captain Harry Brook on Saturday admitted underestimating some teams in their group and promised to dish out stronger performances in the Super 8 stage in the T20 World Cup. England, the two-time champions of the tournament, have been far from convincing thus far with three nervy victories against associate nations and a loss at the hands of former champions West Indies.

They nearly lost to lowly Nepal before scraping to a four-run win and suffered a comprehensive 30-run defeat to former champions West Indies before beating Scotland and Italy to reach the Super 8s. They face co-hosts Sri Lanka in their first Super 8s match here on Sunday.

"It was obviously a niggly start to the competition. We probably underesti...