Chris designed a weight-training program for Tim and videotaped all his amateur games -- the two of them would critically review them the next day -- except for road games when Tim was in college. By then Chris knew his younger son's mechanics so well that even while listening to those games on the radio, he could "see" what Tim was doing wrong. "Watch the angle of your shoulders!" he might yell, for example, at the radio when his son's location was particularly off.
In the stands Chris would sit behind home plate and flash signals to Tim, who knew exactly what to correct. If, for instance, Chris slapped his thighs, Tim knew to "sit down on my legs" through his delivery, to use the lower half of his body more. "His dad obviously did a very good job with Timmy," says Giants pitching coach Dave Righetti. "I treat Timmy differently from most pitchers: I leave him alone."