PHP/MySQL - Trying to Pass Query Variables From MySQL Fetch Array Through Page URL

I'm running a script that fetches a row from a MySQL table and is supposed to then pass certain variables from that row to the next page to be used in a form that allows user updating.

Here's the excerpt from the script that is trying to pass the variables to the next page:

if ($row['home_score'] == '0' && $row['away_score'] == '0') {
        echo '<td><a href="report_score.html?league=test_league&game_id=" . $row['game_id']"><img src="images/report_icon.png" alt="Report Score" /></a></td>';        
    }

If I omit everything after "&game_id=" in the href, it displays fine. However, once I start adding the variables, it cuts off the function and stops displaying the page.

Am I doing something simple wrong with the syntax? I've tried playing around with different ways to write it, but to no avail. Do I need to utilize a http_build_query() to make this work?

Here's the entire script code if you need more info:

<?php

// Connect to the database:
require ('../mysqli_connect.php');

// Make the query for games from the schedule database and determine the game location:
$q = "SELECT tl.game_date, tl.game_time, tl.away_team, tl.home_team, tl.home_score,tl.away_score, tl.arbiter_id, us.football_location, us.football_map 
FROM test_league tl
    INNER JOIN user_schools us ON (tl.home_team = us.school_name)
ORDER BY tl.game_id";
$r = mysqli_query($db, $q);

// Declare two variables to help determine the background color of each row:
$i = 0;
$bgcolor = array('row1', 'row2');

// Begin function to print each game as a row:
while ($row = mysqli_fetch_array($r, MYSQLI_ASSOC)) {

    echo '<tr class="' . $bgcolor[$i++ % 2] .'"><td>' . $row['game_date'] . '</td><td>' . $row['game_time'] . '</td><td class="alignleft"><a href="">' . $row['away_team'] . '</a> vs<br><a href="">' . $row['home_team'] . '</a></td>';

    // Determine if the score has been reported:
    if ($row['home_score'] == '0' && $row['away_score'] == '0') {
        echo '<td><a href="report_score.html?league=test_league&game_id=" . $row['game_id']"><img src="images/report_icon.png" alt="Report Score" /></a></td>';        
    } else {
        echo '<td>' . $row['home_score'] . '<br>' . $row['away_score'] . '</td>';
    }

    echo '<td><a href="' . $row['football_map'] . '" target="_blank">' . $row['football_location'] . '</a></td><td><a href="">' . $row['arbiter_id'] . '</a></td></tr>';

}

mysqli_free_result ($r);

mysqli_close($db);

?>

Any and all advice is greatly appreciated!