def _request_xml(sport):
    """
    Request XML data from scorespro.com

    :param sport: sport being played
    :type sport: string
    :return: XML data
    :rtype: string
    """
    url = 'http://www.scorespro.com/rss2/live-{}.xml'.format(sport)
    r = requests.get(url)
    if r.ok:
        return _load_xml(r.content)
    else:
        raise errors.SportError(sport)