WASHINGTON — A federal grand jury’s indictment of pitching great Roger Clemens for allegedly lying to Congress about his use of steroids deals a further blow to baseball, reinforcing the game’s image as a sport where the use of performance enhancing drugs was widespread.

The six-count indictment alleges that one of the most dominant pitchers of his era obstructed a congressional inquiry with 15 different statements made under oath, including denials that he had ever used steroids or human growth hormone. As he did when he testified to a House committee in 2008, the seven-time Cy Young winner denied using the substances again Thursday and said he will fight to clear his name.