Sri Lanka cricketer Bhanuka Rajapaksa was impressed with the performance of the frontline bowlers in the massive seven-wicket victory against Namibia in a First Round Group A game at the ICC T20 World Cup here, but added the former T20 world champions "can' be happy with all of the performance because there are many parts we need to improve".

Sri Lanka reduced Namibia to a sub-100 total with some excellent all-round bowling performance and then notched up the target for the loss of three wickets in 13.3 overs, thus beginning their campaign to secure a 'Super 12' berth on a positive note on Monday.