Use template function and load as needed

includes/shortcodes/class-sp-shortcode-countdown.php

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+<?php
+/**
+ * Countdown Shortcode
+ *
+ * @author 		ThemeBoy
+ * @category 	Shortcodes
+ * @package 	SportsPress/Shortcodes/Countdown
+ * @version     0.7
+ */
+class SP_Shortcode_Countdown {
+
+	/**
+	 * Output the countdown shortcode.
+	 *
+	 * @param array $atts
+	 */
+	public static function output( $atts ) {
+
+		if ( ! isset( $atts['id'] ) && isset( $atts[0] ) && is_numeric( $atts[0] ) )
+			$atts['id'] = $atts[0];
+
+		sp_get_template( 'countdown.php', $atts );
+	}
+}

includes/shortcodes/class-sp-shortcode-event-calendar.php

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+<?php
+/**
+ * Event Calendar Shortcode
+ *
+ * @author 		ThemeBoy
+ * @category 	Shortcodes
+ * @package 	SportsPress/Shortcodes/Event_Calendar
+ * @version     0.7
+ */
+class SP_Shortcode_Event_Calendar {
+
+	/**
+	 * Output the event calendar shortcode.
+	 *
+	 * @param array $atts
+	 */
+	public static function output( $atts ) {
+
+		if ( ! isset( $atts['id'] ) && isset( $atts[0] ) && is_numeric( $atts[0] ) )
+			$atts['id'] = $atts[0];
+
+		sp_get_template( 'event-calendar.php', $atts );
+	}
+}

includes/shortcodes/class-sp-shortcode-event-list.php

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+<?php
+/**
+ * Event List Shortcode
+ *
+ * @author 		ThemeBoy
+ * @category 	Shortcodes
+ * @package 	SportsPress/Shortcodes/Event_List
+ * @version     0.7
+ */
+class SP_Shortcode_Event_List {
+
+	/**
+	 * Output the event list shortcode.
+	 *
+	 * @param array $atts
+	 */
+	public static function output( $atts ) {
+
+		if ( ! isset( $atts['id'] ) && isset( $atts[0] ) && is_numeric( $atts[0] ) )
+			$atts['id'] = $atts[0];
+
+		sp_get_template( 'event-list.php', $atts );
+	}
+}

includes/shortcodes/class-sp-shortcode-league-table.php

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+<?php
+/**
+ * League Table Shortcode
+ *
+ * @author 		ThemeBoy
+ * @category 	Shortcodes
+ * @package 	SportsPress/Shortcodes/League_Table
+ * @version     0.7
+ */
+class SP_Shortcode_League_Table {
+
+	/**
+	 * Output the league table shortcode.
+	 *
+	 * @param array $atts
+	 */
+	public static function output( $atts ) {
+
+		if ( ! isset( $atts['id'] ) && isset( $atts[0] ) && is_numeric( $atts[0] ) )
+			$atts['id'] = $atts[0];
+
+		sp_get_template( 'league-table.php', $atts );
+	}
+}

includes/shortcodes/class-sp-shortcode-player-gallery.php

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+<?php
+/**
+ * Player Gallery Shortcode
+ *
+ * @author 		ThemeBoy
+ * @category 	Shortcodes
+ * @package 	SportsPress/Shortcodes/Player_Gallery
+ * @version     0.7
+ */
+class SP_Shortcode_Player_Gallery {
+
+	/**
+	 * Output the player gallery shortcode.
+	 *
+	 * @param array $atts
+	 */
+	public static function output( $atts ) {
+
+		if ( ! isset( $atts['id'] ) && isset( $atts[0] ) && is_numeric( $atts[0] ) )
+			$atts['id'] = $atts[0];
+
+		sp_get_template( 'player-gallery.php', $atts );
+	}
+}

includes/shortcodes/class-sp-shortcode-player-list.php

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+<?php
+/**
+ * Player List Shortcode
+ *
+ * @author 		ThemeBoy
+ * @category 	Shortcodes
+ * @package 	SportsPress/Shortcodes/Player_List
+ * @version     0.7
+ */
+class SP_Shortcode_Player_List {
+
+	/**
+	 * Output the player list shortcode.
+	 *
+	 * @param array $atts
+	 */
+	public static function output( $atts ) {
+
+		if ( ! isset( $atts['id'] ) && isset( $atts[0] ) && is_numeric( $atts[0] ) )
+			$atts['id'] = $atts[0];
+
+		sp_get_template( 'player-list.php', $atts );
+	}
+}