diff --git a/www/js/pages/tennis/controller.js b/www/js/pages/tennis/controller.js
index 976e5f42536722d1a5f49c7a9ccb9fdb7dc59727..b0de11fb6997ee9187f3854dd391aeb3d8ebcbb8 100644
--- a/www/js/pages/tennis/controller.js
+++ b/www/js/pages/tennis/controller.js
@@ -121,7 +121,7 @@
         prediction.prediction_win_first,
         prediction.prediction_win_second
       ];
-      percentages.sort();
+      percentages.sort(function(a, b){return a-b});
       if (percentages.indexOf(value) === 1) {
         return "main-prediction";
       }
@@ -154,7 +154,7 @@
         'green-tick'
       ];
 
-      percentages.sort();
+      percentages.sort(function(a, b){return a-b});
       var predictionWin = null;
       if (prediction.winner) {
         predictionWin = prediction.prediction_win_second;