THE FATHER HAD seen this look many times before: the jaw set, the dark eyes narrowing, the posture tense. This is the transformation the son undergoes every time he loses: the optimism, usually about three feet thick, is replaced with a brittle sulk, as if the moment he is less than completely consumed by losing is the moment he will become forever defined by it. Greg Vitello watched his son, Tony, manage the San Francisco Giants against Team USA on a perfectly fine March Tuesday afternoon at Scottsdale Stadium in Arizona. All spring training games are exhibitions, but this game, an exhibition within the exhibition season, contained multiple layers of insignificance. There was a group of big league superstars in the third-base dugout. On the first-base side, a Giants roster depleted by seven of its own World Baseball Classic players.…