LOS ANGELES — Rules are rules, and Buck Showalter was the only manager in the house who was aware of them. The Dodgers, trailing by five runs in the ninth inning of the Mets' 9-4 win on Saturday night, tried to let outfielder Zach McKinstry take the mound. Dave Roberts, the Dodgers manager, then found out from the umpires that his team must be trailing by six or more runs to let a position ...