Index: wp-content/themes/twentyfourteen/content-featured-post.php
===================================================================
--- wp-content/themes/twentyfourteen/content-featured-post.php	(revision 26045)
+++ wp-content/themes/twentyfourteen/content-featured-post.php	(working copy)
@@ -13,15 +13,15 @@
 	<?php
 		if ( has_post_thumbnail() ) :
 			if ( 'grid' == get_theme_mod( 'featured_content_layout' ) )
-				the_post_thumbnail( 'post-thumbnail-grid' );
+				the_post_thumbnail( 'post-thumbnail' );
 			else
-				the_post_thumbnail( 'post-thumbnail-slider' );
+				the_post_thumbnail( 'post-thumbnail-full-width' );
 		endif;
 	?>
 	</a>
 
 	<header class="entry-header">
-		<?php if ( in_array( 'category', get_object_taxonomies( get_post_type() ) ) &&twentyfourteen_categorized_blog() ) : ?>
+		<?php if ( in_array( 'category', get_object_taxonomies( get_post_type() ) ) && twentyfourteen_categorized_blog() ) : ?>
 		<div class="entry-meta">
 			<span class="cat-links"><?php echo get_the_category_list( _x( ', ', 'Used between list items, there is a space after the comma.', 'twentyfourteen' ) ); ?></span>
 		</div><!-- .entry-meta -->
Index: wp-content/themes/twentyfourteen/functions.php
===================================================================
--- wp-content/themes/twentyfourteen/functions.php	(revision 26045)
+++ wp-content/themes/twentyfourteen/functions.php	(working copy)
@@ -68,10 +68,8 @@
 	add_theme_support( 'post-thumbnails' );
 
 	// Add several sizes for Post Thumbnails.
-	add_image_size( 'post-thumbnail-slider', 1038, 576, true );
-	add_image_size( 'post-thumbnail-full-width', 1038, 0 );
-	add_image_size( 'post-thumbnail-grid', 672, 372, true );
-	add_image_size( 'post-thumbnail', 672, 0 );
+	add_image_size( 'post-thumbnail-full-width', 1038, 576, true );
+	add_image_size( 'post-thumbnail', 672, 372, true );
 
 	// This theme uses wp_nav_menu() in two locations.
 	register_nav_menus( array(