The <a href="https://en.wikipedia.org/wiki/American_League" id="mwARo" rel="mw:WikiLink" title="American League">American League</a> of <a href="https://en.wikipedia.org/wiki/Major_League_Baseball" id="mwARs" rel="mw:WikiLink" title="Major League Baseball">Major League Baseball</a> begins using the <a href="https://en.wikipedia.org/wiki/Designated_hitter" id="mwARw" rel="mw:WikiLink" title="Designated hitter">designated hitter</a>.