As Ike Davis walked away from home plate after striking out in a crucial situation in the eighth inning on Sunday, he was showered with unabated scorn by the Citi Field crowd. The first baseman had just made the second out in the Mets’ half of the inning, unable to drive in runners on second and third after striking out for the second time in the game — this time on a breaking ball that bounced in the dirt. His batting average, which had been on the rise, sunk back down to .180. Manager Terry Collins had rearranged his lineup, putting Davis back into the cleanup spot and told him that he had to bear the weight. Davis accepted. But after the Mets’ 3-2 loss to the Pirates yesterday, he bore the burden of failure. "I was slotted in the four-hole in the beginning of the year for a reason," he said. "It’s the type of player I can be. I just haven’t done it this year."