Qatar coach Tintin Marquez said Friday they relish the "positive pressure" of trying to retain their Asian Cup title on home soil, on the eve of a quarter-final with Uzbekistan.The hosts and holders won all three of their games in the group phase without conceding a goal and then defeated Palestine 2-1 in the last 16.Qatar face Uzbekistan on Saturday in front of what is expected to be a packed crowd at the 68,000-capacity Al Bayt Stadium outside Doha.