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"The 26-year-old Marquis went 14-16 for the St. Louis Cardinals in 2006 with a 6.02 ERA. He struggled after the All-Star break, going just 3-10, and did not make the postseason rotation for the eventual World Series champions." quote from above
I would say he quit more then struggled. i saw him pitch several times and it looked like he didn't care. Cardinal fans dont boo the home team much, but he got a few. Also the manager and pitching coach think he is a blockhead . They would try to correct his delivery but he had to do it his own way. And now he's on his way to the Cubs LOL