Potential and upside, even track record, can carry a career only so far. At some point, a player has to put up or shut up. Baseball is a results-oriented industry and if the production isn't there, neither are you.
With it being Opening Day in many ballparks around the major leagues, the following are 10 guys for whom it's now or never. The 2013 season must amount to some form of success and some relative progress after two or three seasons of failure and disappointment.
By now the narrative on Lincecum is well-documented: the Giants’ first-round selection and 10th overall pick in the 2006 draft burst on the major league scene in 2008 and achieved rock star status in San Francisco, when he went 18-5 with a 2.62 ERA, led the league with 265 strikeouts and won the first of his two Cy Young awards. That began a run of four consecutive All-Star appearances and culminated in a World Series championship in 2010.