diff --git a/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Participant.java b/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Participant.java
index 6f85290..31300f5 100644
--- a/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Participant.java
+++ b/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Participant.java
@@ -6,4 +6,5 @@ public interface Participant extends Serializable {
     String getName();
     void setName(String name);
     boolean equals(Participant participant);
+    void change(Participant participant);
 }
diff --git a/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Person.java b/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Person.java
index 9cf624f..73e598b 100644
--- a/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Person.java
+++ b/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Person.java
@@ -4,7 +4,7 @@ import java.io.Serializable;
 
 public class Person implements Serializable {
     private final String NAME_MATCHING_REGEX = "[a-zA-Z]{1,20}";
-    private final String PHONE_MATCHING_REGEX = "[\\+0-9]+";
+    private final String PHONE_MATCHING_REGEX = "[\\+]?[0-9]*";
 
     private String name;
     private String firstName;
diff --git a/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Player.java b/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Player.java
index 3165364..29bb2c6 100644
--- a/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Player.java
+++ b/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Player.java
@@ -29,12 +29,27 @@ public class Player extends Person implements Participant{
     }
 
     public void setDateOfBirth(String dateOfBirth) {
-        String[] date = dateOfBirth.split("\\.");
-        this.dateOfBirth = LocalDate.of(Integer.valueOf(date[2]), Integer.valueOf(date[1]), Integer.valueOf(date[0]));
+        if(dateOfBirth.length() > 0) {
+            String[] date = dateOfBirth.split("\\.");
+            this.dateOfBirth = LocalDate.of(Integer.valueOf(date[2]), Integer.valueOf(date[1]), Integer.valueOf(date[0]));
+        } else {
+            dateOfBirth = null;
+        }
+    }
+
+    public void setDateOfBirth(LocalDate dateOfBirth) {
+        this.dateOfBirth = dateOfBirth;
     }
 
     @Override
     public boolean equals(Participant participant) {
         return getClass().equals(participant.getClass()) && toString().toLowerCase().equals(participant.toString().toLowerCase());
     }
+
+    @Override
+    public void change(Participant participant) {
+        Player player = (Player) participant;
+        setDateOfBirth(player.getDateOfBirth());
+        setPhoneNumber(player.getPhoneNumber());
+    }
 }
diff --git a/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Team.java b/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Team.java
index e815a16..8a2a0ba 100644
--- a/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Team.java
+++ b/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Team.java
@@ -27,11 +27,24 @@ public class Team implements Participant {
         this.name = name;
     }
 
+    public void setPlayers(List<Player> players) {
+        this.players = players;
+    }
+
+    public List<Player> getPlayers() {
+        return players;
+    }
+
     @Override
     public boolean equals(Participant participant) {
         return getClass().equals(participant.getClass()) && toString().toLowerCase().equals(participant.toString().toLowerCase());
     }
 
+    @Override
+    public void change(Participant participant) {
+        return;
+    }
+
     public Person getContactPerson() {
         return contactPerson;
     }
diff --git a/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Tournament.java b/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Tournament.java
index b4097d5..21c9a5e 100644
--- a/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Tournament.java
+++ b/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Tournament.java
@@ -31,8 +31,13 @@ public class Tournament implements Serializable {
         places = new ArrayList<>();
     }
 
-    public void addParticipant(Participant newParticipant) throws ParticipantExistsException {
-        participants.removeIf(participant -> participant.equals(newParticipant));
+    public void saveParticipant(Participant newParticipant) throws ParticipantExistsException {
+        for(Participant participant: participants){
+            if(participant.equals(newParticipant)){
+                participant.change(newParticipant);
+                return;
+            }
+        }
         participants.add(newParticipant);
     }
 
diff --git a/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/TournamentDecorator.java b/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/TournamentDecorator.java
index dcb3112..6f28efd 100644
--- a/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/TournamentDecorator.java
+++ b/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/TournamentDecorator.java
@@ -2,7 +2,6 @@ package ch.zhaw.projekt2.turnierverwaltung;
 
 import java.io.IOException;
 import java.util.ArrayList;
-import java.util.Date;
 import java.util.List;
 
 public class TournamentDecorator implements IsObservable{
@@ -81,7 +80,7 @@ public class TournamentDecorator implements IsObservable{
 
     public void savePlayer(String firstName, String name, String phoneNumber, String dateOfBirth){
         try {
-            tournament.addParticipant(new Player(firstName, name, phoneNumber, dateOfBirth));
+            tournament.saveParticipant(new Player(firstName, name, phoneNumber, dateOfBirth));
             informListener();
         } catch (Tournament.ParticipantExistsException e) {
             e.printStackTrace(); //TODO handle and logging
diff --git a/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/main/participantAddFormular/ParticipantFormularController.java b/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/main/participantAddFormular/ParticipantFormularController.java
index 0528301..8492fdd 100644
--- a/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/main/participantAddFormular/ParticipantFormularController.java
+++ b/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/main/participantAddFormular/ParticipantFormularController.java
@@ -79,6 +79,14 @@ public class ParticipantFormularController extends FXController {
     @FXML
     void saveParticipant(ActionEvent event) {
         getTournamentDecorator().savePlayer(firstNameTextField.getText(), participantNameTextField.getText(), phoneNumberTextField.getText(), birthDateTextField.getText());
+        clearFormular();
+    }
+
+    private void clearFormular() {
+        firstNameTextField.clear();
+        participantNameTextField.clear();
+        phoneNumberTextField.clear();
+        birthDateTextField.clear();
     }
 
     @FXML
diff --git a/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/main/placesAddFormular/PlacesFormularController.java b/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/main/placesAddFormular/PlacesFormularController.java
index c5534e5..036fb4f 100644
--- a/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/main/placesAddFormular/PlacesFormularController.java
+++ b/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/main/placesAddFormular/PlacesFormularController.java
@@ -58,6 +58,11 @@ public class PlacesFormularController extends FXController {
     @FXML
     void savePlace(ActionEvent event) {
         getTournamentDecorator().savePlace(placeNameTextField.getText());
+        clearFormular();
+    }
+
+    private void clearFormular() {
+        placeNameTextField.clear();
     }
 
     @FXML