re: Can somebody explain Goran Ivaniševic's 2nd serve strategy to me?

It’s a strategy players who have booming serves but don’t have great baseline games use. You lay a serve in there a lot slower than your first serve, you’re going to have win that point from the baseline. If the other player is a much better baseliner than you are, you’re going to lose the point. An elite server with a questionable baseline game will win a higher percentage of points with the two “first serve” strategy even with the increased risk of double faults.