Every five days, Masahiro Tanaka gives Yankees fans something to cheer about. But he'll need some help from his teammates, too. Al Bello/Getty Images NEW YORK -- Masahiro Tanaka can only do so much. As brilliant as he has been in his first two months in the major leagues, Tanaka can only pitch every fifth day. He can almost always get the New York Yankees a win. He can't always lift their mood. An