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Felix Hernandez (7-4, 2.49 ERA, 9.40 K/9, 1.75 BB/9)
By most metrics, this is shaping up to be the best season of Felix Hernandez's career.
He did post a slightly lower ERA in his Cy Young season of 2010 than he currently boasts today, but his FIP (2.36) is 0.48 runs better than he finished in any of his other eight seasons. In 2012, he posted the highest strikeout rate and lowest walk rate of his career, amounting to a K/BB ratio of 3.98. This season, he's been even better in both categories and currently owns a K/BB ratio of 5.37.
If he maintains his current pace, there's a very good chance he could start the game. The fact that he's a fringe candidate today says a lot about the respect due to the early returns from the three guys ahead of him.
Max Scherzer (8-0, 3.24 ERA, 10.80 K/9, 2.16 BB/9)
The origin of the phrase "Jack of all trades, master of none" allegedly dates back to the 16th century, but it's extremely applicable to Scherzer today. He's in the top seven of so many categories, but can't seem to claim the lead in any of them.
He's third in the AL in K/9 and seventh in K/BB. Scherzer ranks fourth in FIP and fourth in xFIP, and he has been the third-least-fortunate pitcher in terms of LOB percentage. He's tied for second in WAR and simply seems destined for some sort of runner-up position in the race for the honor of starting the Midsummer Classic.
Justin Verlander (8-4, 3.71 ERA, 10.46 K/9, 2.93 BB/9)
Aside from a below-average ERA due to a pair of awful starts in late May, Verlander has actually been quite dominant this season. His K/9 rate is the highest of his career, and his FIP is the lowest it has ever been. Sadly for him, he currently has the fourth-highest BABIP in the majors, which is giving him worse-looking numbers than he arguably deserves.
Given another month to improve his ERA and distance himself from the rest of the amazing pitching rotation in Detroit, he could easily emerge as the best option to start the All-Star Game.