Here’s the solution…
add_filter( 'genesis_post_title_output', 'ac_post_title_output', 15 );
function ac_post_title_output( $title ) {
if ( is_singular() )
$title = sprintf( '<h1 class="entry-title" id="content">%s</h1>', apply_filters( 'genesis_post_title_text', get_the_title() ) );
return $title;
}