diff --git a/src/Tiebreaks.php b/src/Tiebreaks.php
index 5c308fd..652b789 100644
--- a/src/Tiebreaks.php
+++ b/src/Tiebreaks.php
@@ -232,4 +232,23 @@ abstract class Tiebreaks extends Tournament
         }
         return $tiebreak;
     }
+
+    /**
+     * @param Player $player
+     * @return float|int
+     */
+    protected function calculateCumulative(Player $player)
+    {
+        $tiebreak = 0;
+        foreach ($player->getPairings() as $pairing) {
+            $toadd = 0;
+            if (array_search($pairing->getResult(), Constants::Won) !== false) {
+                $toadd = 1;
+            } elseif (array_search($pairing->getResult(), Constants::Draw) !== false) {
+                $toadd = 0.5;
+            }
+            $tiebreak += $tiebreak + $toadd;
+        }
+        return $tiebreak;
+    }
 }
diff --git a/src/Tournament.php b/src/Tournament.php
index 2f09001..9841ec8 100644
--- a/src/Tournament.php
+++ b/src/Tournament.php
@@ -314,6 +314,9 @@ class Tournament extends Tiebreaks
             case Tiebreak::Kashdan:
                 return $this->calculateKashdan($player);
                 break;
+            case Tiebreak::Cumulative:
+                return $this->calculateCumulative($player);
+                break;
             default:
                 return null;
         }