'php- switch fails before i select an option

I'm having a problem with php switch function. I know it must be simple, but i'm just learning and I can't seem to find the right way to code it. This is the issue: It works fine when you click any of the options, but it sends an error msg when I first load up the page...

<body>
    <?php include ('./header.php')?>

    <section>
        <div class="btn">
            <ul>
                <li><a href="./index.php?opcion=op1">Opcion 1</a></li>
                <li><a href="./index.php?opcion=op2">Opcion 2</a></li>
                <li><a href="./index.php?opcion=op3">Opcion 3</a></li>
            </ul>
        </div>

        <?php 
            if(isset ($_GET['opcion'])) {

            
            switch($_GET['opcion']) {
                case 'op1' :
                    $nombre = 'Magnus Carlsen';
                    $posicion = '1';
                    $puntaje = '2840';
                    $img = './magnus.jpg';
                break;
                case 'op2' :
                    $nombre = 'Ian Nepomniatchi';
                    $posicion = '2';
                    $puntaje = '2812';
                    $img = './nepo.jpeg';
                break;
                case 'op3' :
                    $nombre = 'Ding Liren';
                    $posicion = '3';
                    $puntaje = '2760';
                    $img = './ding.jpg';
                break;
                }
            }
            else {
                
            }
            
            ?>
             <div class="show">
                    <h3><?php echo $nombre?></h2>
                    <h4><?php echo $posicion?></h4>
                    <p><?php echo $puntaje?></p>
                    <div class="contenedor_img">
                        <img src="<?php echo $img ?>" alt="foto">
                    </div>
                </div>

Now, I suppose the "show" div shouldn't be there... but it doesn't responde well when i move it around either...

this are the errors:

Warning: Undefined variable $nombre in C:\xampp\htdocs\dashboard\proyectos\PHP\index.php on line 53

Warning: Undefined variable $posicion in C:\xampp\htdocs\dashboard\proyectos\PHP\index.php on line 54

Warning: Undefined variable $puntaje in C:\xampp\htdocs\dashboard\proyectos\PHP\index.php on line 55 foto

phpswitch-statement


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