SAN ANTONIO — Tony Parker made good on his pledge before Game 4 of the NBA Finals: He was ready to go. He just didn't have it in him to finish. What began as a spectacular, told-you-so performance from the All-Star point guard ended with a scoreless second half and second-guessing about his strained right hamstring, which Parker said gradually sapped his strength as the San Antonio Spurs lost to the resurgent Miami Heat 109-93 on Thursday night.