Ballplayers with sense and experience preach about not gettingtoo high or too low. For the sake of their mental health, itbehooves them not to tie their emotions to the undulations of a162-game season. They are human, however, and the Giants are a confident bunch withthe way they are playing despite losing Buster Posey and FreddySanchez to devastating injuries. Though they fell 3-2 Thursday night on Justin Upton's10th-inning home run against Santiago Casilla, the Giants are in a good place headinginto their 70th game tonight, in Oakland, the first of nine theyplay against the American League before the Fourth of July.