Peavy, entering his age-31 season, was coming off three injury-plagued and ineffective seasons in which he'd thrown a combined 320 1/3 innings. Haren, also entering his age-31 season, was coming off his seventh consecutive 200-plus-inning campaign, having led the AL in starts and strikeout-to-walk ratio and finished seventh in Cy Young voting the season before.
But 2012 proved pivotal in determining the size of the contract that each impending free agent could command. Peavy picked the perfect time to find his form, avoiding the DL, topping 200 innings and making the All-Star team for the first time since 2007. Haren had back problems and saw his sinker lose speed and his stats decline across the board. As a reward for his resurgence, Peavy got a two-year, $29 million extension from the Sox, while Haren had to settle for a one-year deal with the Nats at a slightly lower annual value.
Performance in a player's walk year isn't everything, but it's the last thing potential suitors see, and thus the freshest in their minds. No player wants to make a negative impression right before the bidding begins. The following five players entering the final year of their contracts in 2013 are balanced on the border between "about to be rich" and "about to be richer." If they can turn in strong seasons, they'll command big-time contracts, but any missteps could cost them some serious cash.