fourth season
... that the Arizona Diamondbacks won the World Series in just their fourth season of Major League Baseball?
... that the <a href="./Arizona_Diamondbacks" id="mwFzU" rel="mw:WikiLink" title="Arizona Diamondbacks">Arizona Diamondbacks</a> won the World Series in just their <b id="mwFzY"><a class="mw-redirect" href="./Arizona_Diamondbacks_seasons" id="mwFzc" rel="mw:WikiLink" title="Arizona Diamondbacks seasons">fourth season</a></b> of <a href="./Major_League_Baseball" id="mwFzg" rel="mw:WikiLink" title="Major League Baseball">Major League Baseball</a>?