There could be no surer wager in sports than this: When MiguelTejada had to wait on deck for more than 2 1/2 hours in the thirdinning Saturday night, you could have bet a lung he would swing atthe first pitch when he finally came to bat. He did, and he hit a grand slam to give the Giants a 10-0 lead on their way to a15-3 bacchanalia marked by two impressive displays of power, one bythe San Francisco lineup and the other by the forces of nature.