SAN FRANCISCO, Oct 25 - The Detroit Tigers, taking on the San Francisco Giants in pursuit of their first World Series crown since 1984, may have to achieve their mission without help from struggling closer Jose Valverde. Valverde saved 35 games in the regular season but during the playoffs has imploded, getting hammered in the American League Division Series against Oakland, the league championship series against New York and in Wednesday's opener of the World Series. ...