Task: Translation
Input (Japanese): ボクシングの観客は、ディアスは非常に重いパンチをくりだすが、パッキャオのスピードと強いパンチには警戒が必要だとみている。
Output (English): Boxing punters observed that Diaz has a lot of heft in the way he delivers his punches but Pacquiao's speed and strong punches are something Diaz should be wary about.