diff --git a/java/com.sap.sailing.domain.swisstimingadapter/src/com/sap/sailing/domain/swisstimingadapter/impl/DomainFactoryImpl.java b/java/com.sap.sailing.domain.swisstimingadapter/src/com/sap/sailing/domain/swisstimingadapter/impl/DomainFactoryImpl.java
index 5ca05cc49ec..7ea121022b3 100755
--- a/java/com.sap.sailing.domain.swisstimingadapter/src/com/sap/sailing/domain/swisstimingadapter/impl/DomainFactoryImpl.java
+++ b/java/com.sap.sailing.domain.swisstimingadapter/src/com/sap/sailing/domain/swisstimingadapter/impl/DomainFactoryImpl.java
@@ -93,7 +93,10 @@ public class DomainFactoryImpl implements DomainFactory {
 
     @Override
     public Regatta getOrCreateRegatta(String raceID, TrackedRegattaRegistry trackedRegattaRegistry) {
-        Regatta result = raceIDToRegattaCache.get(raceID);
+        Regatta result = trackedRegattaRegistry.getRememberedRegattaForRace(raceID);
+        if (result == null) {
+            result = raceIDToRegattaCache.get(raceID);
+        }
         if (result == null) {
             result = new RegattaImpl(raceID, null, trackedRegattaRegistry);
             logger.info("Created regatta "+result.getName()+" ("+result.hashCode()+")");
diff --git a/java/com.sap.sailing.domain.swisstimingadapter/src/com/sap/sailing/domain/swisstimingadapter/impl/SwissTimingRaceTrackerImpl.java b/java/com.sap.sailing.domain.swisstimingadapter/src/com/sap/sailing/domain/swisstimingadapter/impl/SwissTimingRaceTrackerImpl.java
index 6e2cb2da9b1..281808ed330 100644
--- a/java/com.sap.sailing.domain.swisstimingadapter/src/com/sap/sailing/domain/swisstimingadapter/impl/SwissTimingRaceTrackerImpl.java
+++ b/java/com.sap.sailing.domain.swisstimingadapter/src/com/sap/sailing/domain/swisstimingadapter/impl/SwissTimingRaceTrackerImpl.java
@@ -73,7 +73,6 @@ public class SwissTimingRaceTrackerImpl extends AbstractRaceTrackerImpl implemen
             DomainFactory domainFactory, SwissTimingFactory factory, RaceSpecificMessageLoader messageLoader,
             TrackedRegattaRegistry trackedRegattaRegistry, boolean canSendRequests, long delayToLiveInMillis) throws InterruptedException,
             UnknownHostException, IOException, ParseException {
-        // TODO bug 733: use trackedRegattaRegistry to obtain a regatta using the race ID
         this(domainFactory.getOrCreateRegatta(raceID, trackedRegattaRegistry), raceID, hostname, port, windStore, domainFactory, factory,
                 messageLoader, trackedRegattaRegistry, canSendRequests, delayToLiveInMillis);
     }
diff --git a/java/com.sap.sailing.domain.test/src/com/sap/sailing/domain/test/DummyTrackedRegattaRegistry.java b/java/com.sap.sailing.domain.test/src/com/sap/sailing/domain/test/DummyTrackedRegattaRegistry.java
index afa47004b63..19bcb08d546 100755
--- a/java/com.sap.sailing.domain.test/src/com/sap/sailing/domain/test/DummyTrackedRegattaRegistry.java
+++ b/java/com.sap.sailing.domain.test/src/com/sap/sailing/domain/test/DummyTrackedRegattaRegistry.java
@@ -1,5 +1,6 @@
 package com.sap.sailing.domain.test;
 
+import java.io.Serializable;
 import java.util.HashMap;
 import java.util.Map;
 
@@ -40,7 +41,7 @@ public class DummyTrackedRegattaRegistry implements TrackedRegattaRegistry {
     }
 
     @Override
-    public Regatta getRememberedRegattaForRace(RaceDefinition race) {
+    public Regatta getRememberedRegattaForRace(Serializable race) {
         return null;
     }
 
diff --git a/java/com.sap.sailing.domain.tractracadapter/src/com/sap/sailing/domain/tractracadapter/DomainFactory.java b/java/com.sap.sailing.domain.tractracadapter/src/com/sap/sailing/domain/tractracadapter/DomainFactory.java
index 6ce4dd680e4..04b516f61da 100755
--- a/java/com.sap.sailing.domain.tractracadapter/src/com/sap/sailing/domain/tractracadapter/DomainFactory.java
+++ b/java/com.sap.sailing.domain.tractracadapter/src/com/sap/sailing/domain/tractracadapter/DomainFactory.java
@@ -2,6 +2,7 @@ package com.sap.sailing.domain.tractracadapter;
 
 import java.io.FileNotFoundException;
 import java.io.IOException;
+import java.io.Serializable;
 import java.net.MalformedURLException;
 import java.net.URI;
 import java.net.URISyntaxException;
@@ -241,4 +242,9 @@ public interface DomainFactory {
      */
     void removeRace(Event tractracEvent, Race tractracRace, TrackedRegattaRegistry trackedRegattaRegistry);
 
+    /**
+     * Computes an ID to use for a {@link RaceDefinition} based on the TracTrac race.
+     */
+    Serializable getRaceID(Race tractracRace);
+
 }
diff --git a/java/com.sap.sailing.domain.tractracadapter/src/com/sap/sailing/domain/tractracadapter/impl/DomainFactoryImpl.java b/java/com.sap.sailing.domain.tractracadapter/src/com/sap/sailing/domain/tractracadapter/impl/DomainFactoryImpl.java
index c58bdd1dd75..60445834518 100644
--- a/java/com.sap.sailing.domain.tractracadapter/src/com/sap/sailing/domain/tractracadapter/impl/DomainFactoryImpl.java
+++ b/java/com.sap.sailing.domain.tractracadapter/src/com/sap/sailing/domain/tractracadapter/impl/DomainFactoryImpl.java
@@ -2,6 +2,7 @@ package com.sap.sailing.domain.tractracadapter.impl;
 
 import java.io.FileNotFoundException;
 import java.io.IOException;
+import java.io.Serializable;
 import java.net.MalformedURLException;
 import java.net.URI;
 import java.net.URISyntaxException;
@@ -314,6 +315,11 @@ public class DomainFactoryImpl implements DomainFactory {
                 ReceiverType.MARKPASSINGS, ReceiverType.MARKPOSITIONS, ReceiverType.RACESTARTFINISH, ReceiverType.RAWPOSITIONS);
     }
     
+    @Override
+    public Serializable getRaceID(Race tractracRace) {
+        return tractracRace.getId();
+    }
+
     @Override
     public void removeRace(com.tractrac.clientmodule.Event tractracEvent, Race tractracRace, TrackedRegattaRegistry trackedRegattaRegistry) {
         RaceDefinition raceDefinition;
@@ -370,7 +376,7 @@ public class DomainFactoryImpl implements DomainFactory {
                 Pair<List<Competitor>, BoatClass> competitorsAndDominantBoatClass = getCompetitorsAndDominantBoatClass(race);
                 logger.info("Creating RaceDefinitionImpl for race "+race.getName());
                 raceDefinition = new RaceDefinitionImpl(race.getName(), course, competitorsAndDominantBoatClass.getB(),
-                        competitorsAndDominantBoatClass.getA(), race.getId());
+                        competitorsAndDominantBoatClass.getA(), getRaceID(race));
                 // add to domain Event only if boat class matches
                 if (raceDefinition.getBoatClass() == trackedRegatta.getRegatta().getBoatClass()) {
                     trackedRegatta.getRegatta().addRace(raceDefinition);
diff --git a/java/com.sap.sailing.domain.tractracadapter/src/com/sap/sailing/domain/tractracadapter/impl/TracTracRaceTrackerImpl.java b/java/com.sap.sailing.domain.tractracadapter/src/com/sap/sailing/domain/tractracadapter/impl/TracTracRaceTrackerImpl.java
index 3e0863361aa..9ece623a264 100755
--- a/java/com.sap.sailing.domain.tractracadapter/src/com/sap/sailing/domain/tractracadapter/impl/TracTracRaceTrackerImpl.java
+++ b/java/com.sap.sailing.domain.tractracadapter/src/com/sap/sailing/domain/tractracadapter/impl/TracTracRaceTrackerImpl.java
@@ -5,6 +5,7 @@ import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
+import java.io.Serializable;
 import java.net.MalformedURLException;
 import java.net.URI;
 import java.net.URISyntaxException;
@@ -173,12 +174,18 @@ public class TracTracRaceTrackerImpl extends AbstractRaceTrackerImpl implements
         // Start live and stored data streams
         ioThread = new Thread(controller, "I/O for event "+tractracEvent.getName()+", race URL "+paramURL);
         for (Race tractracRace : tractracEvent.getRaceList()) {
+            // Try to find a pre-associated event based on the Race ID
+            if (regatta == null) {
+                Serializable raceID = domainFactory.getRaceID(tractracRace);
+                regatta = trackedRegattaRegistry.getRememberedRegattaForRace(raceID);
+            }
             // removeRace may detach the domain regatta from the domain factory if that
             // removed the last race; therefore, it's important to getOrCreate the
             // domain regatta *after* calling removeRace
             domainFactory.removeRace(tractracEvent, tractracRace, trackedRegattaRegistry);
         }
-        // TODO bug 733: use trackedRegattaRegistry to obtain a regatta using the race ID
+        // if regatta is still null, no previous assignment of any of the races in this TracTrac event to a Regatta was found;
+        // in this case, create a default regatta based on the TracTrac event data
         this.regatta = regatta == null ? domainFactory.getOrCreateRegatta(tractracEvent, trackedRegattaRegistry) : regatta;
         trackedRegatta = trackedRegattaRegistry.getOrCreateTrackedRegatta(this.regatta);
         receivers = new HashSet<Receiver>();
diff --git a/java/com.sap.sailing.domain/src/com/sap/sailing/domain/tracking/TrackedRegattaRegistry.java b/java/com.sap.sailing.domain/src/com/sap/sailing/domain/tracking/TrackedRegattaRegistry.java
index 9e7c8710373..41b58e32c1a 100755
--- a/java/com.sap.sailing.domain/src/com/sap/sailing/domain/tracking/TrackedRegattaRegistry.java
+++ b/java/com.sap.sailing.domain/src/com/sap/sailing/domain/tracking/TrackedRegattaRegistry.java
@@ -1,5 +1,7 @@
 package com.sap.sailing.domain.tracking;
 
+import java.io.Serializable;
+
 import com.sap.sailing.domain.base.RaceDefinition;
 import com.sap.sailing.domain.base.Regatta;
 
@@ -34,10 +36,11 @@ public interface TrackedRegattaRegistry {
      * regatta will be returned.
      * <p>
      * 
-     * If no such explicit assignment has been performed, an "appropriate" non-persistent default regatta will be
-     * selected and returned.
+     * If no such explicit assignment has been performed, <code>null</code> is returned.
+     * 
+     * @param raceID the ID as obtained from {@link RaceDefinition#getId()}
      */
-    Regatta getRememberedRegattaForRace(RaceDefinition race);
+    Regatta getRememberedRegattaForRace(Serializable raceID);
     
     /**
      * Persistently remembers the association of the race with its {@link RaceDefinition#getId()} to the
diff --git a/java/com.sap.sailing.server/src/com/sap/sailing/server/impl/RacingEventServiceImpl.java b/java/com.sap.sailing.server/src/com/sap/sailing/server/impl/RacingEventServiceImpl.java
index b8034af1f16..f5c8e332f1f 100755
--- a/java/com.sap.sailing.server/src/com/sap/sailing/server/impl/RacingEventServiceImpl.java
+++ b/java/com.sap.sailing.server/src/com/sap/sailing/server/impl/RacingEventServiceImpl.java
@@ -1374,8 +1374,8 @@ public class RacingEventServiceImpl implements RacingEventService, RegattaListen
     }
 
     @Override
-    public Regatta getRememberedRegattaForRace(RaceDefinition race) {
-        return persistentRegattasForRaceIDs.get(race.getId().toString());
+    public Regatta getRememberedRegattaForRace(Serializable raceID) {
+        return persistentRegattasForRaceIDs.get(raceID.toString());
     }
 
     @Override