The New York Yankees are firing on all cylinders, and a lot of that success stems from stellar starting pitching . As of Wednesday morning, the Yankees' starters boast an MLB-best 2.70 ERA, and while that is nice, it'd be great if the bullpen followed suit. Instead, New York's relievers own a 3.86 ERA, which isn't the worst, but it is the 12th-best mark in the Majors, leaving much room for improvement. Closing pitcher David Bednar contributed to the Yankees' early bullpen concerns . Although the veteran righty notched a save in each of his first five appearances, he still looked shaky on the mound and left the door open for opponents to have a chance to tie the game or take the lead. Needless to say, New York fans were hoping that Bednar would figure things out before general manager Brian Cashman considered finding a replacement arm. As April wraps up, it's clear that any early doubts were overblown.…