Afghanistan beat Bangladesh by six wickets in the second match to secure an indisputable lead in the three-match T-20 series here on Tuesday night. Earlier, Bangladesh won the toss and decided to bat first. The Bangladeshi team scored 134 runs for the loss of eight wickets with Tamim Iqbal scoring the highest- 43 runs for the team. For Afghanistan, spinner Rashid Khan took four wickets giving 12 runs. Chasing the target of 135 runs, the Afghans managed to achieve it in 18.5 overs. Samiullah Shenwari was the top scorer for the team with 49 runs in 40 balls. The third and final match in the series is slated to be played on Thursday with the Bangladeshi team looking to salvage the situation by not losing the series 0-3.