Right now, the Orioles seem to have four pitchers who are essentially locked in to the Opening Day starting rotation, barring injuries: Jason Hammel, Wei-Yin Chen, Chris Tillman and Miguel Gonzalez. But the fifth starter's spot remains up for grabs, and it's sure to be hotly contested this spring. With Grapefruit League games set to begin on Feb. 23, a smorgasbord of Orioles pitchers will get a chance to make an impression on manager Buck Showalter. Which pitcher has the best chance to stake his claim on the final rotation spot? Let's weigh the odds.