ALBAWABA - The James Cameron megahit "Avatar: Fire and Ash" will be up against Chris Pratt's sci-fi movie "Mercy" at the weekend box office. "Mercy" wants to make between $10 million and $13 million over the weekend from 3,400 screens in North America. The sixth installment of "Avatar" aims to earn between $8 million and $10 million. It has spent five weeks at the top of the domestic charts. "Mercy" ...