Many MLB contracts are backloaded. For example, Alex Rodriguez will be making over $30 million USD per year at the end of his deal in 2017, much higher than the average annual value.
I understand that clubs sometimes do this to ease the burden on the luxury tax at the beginning, but as players age, they typically decline, causing all of those dollars committed at the end of the contract to be an albatross. Why do we not see clubs front-loading contracts, where they will pay the most for a player while he is in his prime?