Sri Lanka post a mammoth total of 332 with just 1 wicket down. Opener Tillakaratne Dilshan and Kumar Sangakkara were outstanding scoring 161* and 105* respectively.
Bangladesh were bowled out with just 240 runs in 47 overs as Lasith Malinga announced his return to form with three for 35 in nine overs.
While the win was an important one for the Lankans, Mathews is already looking forward to the clash against England and said it was important to peak at the right time of the tournament.
After the match Mathews said: “Of course, they [Dilshan and Sangakkara] were brilliant tonight to be honest. The start that they got, Thirimanne and Dilshan.
“Dilshan was amazing, they got off to a brilliant start and they took calculated risks and it was a brave effort by the three batters.
“It was kind of a clinical performance by the whole team. Well, I wouldn’t say clinical because we were slightly sloppy on the field. We could have done better. Once you get that 300-plus mark, the bowlers have the freedom to go there and bowl freely.
“Of course it’s important to peak at the right time and I think when it comes to the quarter-finals that’s when it matters. We’ll try and take one game at a time and try and win all the games.
“The boys are on a high and they played pretty well in the last two games and we are ready for the England game.”