Jun 08, 2011; June 8, 2011; Pittsburgh,PA, USA: Pittsburgh Pirates second baseman Neil walker (18) celebrates in the on-deck circle after teammate Andrew McCutchen (not pictured) hit a walk off home run against the Arizona Diamondbacks during the twelfth inning at PNC Park. The Pirates won 3-2 in twelve innings. Mandatory Credit: Charles LeClaire-USPRESSWIRE; Mandatory Credit: Charles LeClaire-Imagn Images