diff --git a/src/components/HomePage/HomePage.html b/src/components/HomePage/HomePage.html
index 2298f88..a179fb1 100644
--- a/src/components/HomePage/HomePage.html
+++ b/src/components/HomePage/HomePage.html
@@ -149,7 +149,7 @@
           <w-button @click="apriDialogConfig()">
             <img src="/gear.png" width="25" />
           </w-button>
-          <w-button @click="sp.servHome = !sp.servHome">
+          <w-button @click="cambiaPalla" :disabled="!isPunteggioZeroZero">
             <img src="/serv.png" width="25" />
           </w-button>
           <w-confirm top left question="Azzero punteggio ?" cancel="NO" confirm="SI" @confirm="resetta">
diff --git a/src/components/HomePage/HomePage.js b/src/components/HomePage/HomePage.js
index 1c9a871..0741da9 100644
--- a/src/components/HomePage/HomePage.js
+++ b/src/components/HomePage/HomePage.js
@@ -38,6 +38,11 @@ export default {
     }
     this.abilitaTastiSpeciali();
   },
+  computed: {
+    isPunteggioZeroZero() {
+      return this.sp.punt.home === 0 && this.sp.punt.guest === 0;
+    }
+  },
   methods: {
     closeApp() {
       var win = window.open("", "_self");
@@ -69,6 +74,13 @@ export default {
       this.sp.striscia = { home: [0], guest: [0] }
       this.sp.servizioPrecedente = []
     },
+    cambiaPalla() {
+      if (!this.isPunteggioZeroZero) {
+        this.$waveui.notify("Cambio palla consentito solo a inizio set (0-0)", "warning");
+        return;
+      }
+      this.sp.servHome = !this.sp.servHome;
+    },
     incSet(team) {
       if (this.sp.set[team] == 2) {
         this.sp.set[team] = 0;
@@ -216,7 +228,7 @@ export default {
       } else if (e.shiftKey && e.key == "ArrowRight") {
         this.incSet("guest")
       } else if (e.ctrlKey && e.key == "ArrowLeft") {
-        this.sp.servHome = !this.sp.servHome
+        this.cambiaPalla()
       } else { return false }
     }
   }