All the Spurs have done thus far is hold serve, and I suspect the Suns will continue to do the same thing. All the talking heads will continue to tell you the Suns are in trouble, the series is over, but they are wrong. The Suns will win tonight, win Sunday, and go back to San Antonio for game 5 with the series tied at two games apiece. Then all the talking heads will be telling you that the Spurs are in trouble, the series is over, etc.
Until somebody wins on the road, there is no story.