Index: lucene/src/java/org/apache/lucene/search/spans/SpanWeight.java
===================================================================
--- lucene/src/java/org/apache/lucene/search/spans/SpanWeight.java	(revision 1039149)
+++ lucene/src/java/org/apache/lucene/search/spans/SpanWeight.java	(working copy)
@@ -111,7 +111,7 @@
     fieldExpl.setDescription("fieldWeight("+field+":"+query.toString(field)+
                              " in "+doc+"), product of:");
 
-    Explanation tfExpl = ((SpanScorer)scorer(reader, true, false)).explain(doc);
+    Explanation tfExpl = explainTF(reader, doc);
     fieldExpl.addDetail(tfExpl);
     fieldExpl.addDetail(idfExpl);
 
@@ -139,4 +139,9 @@
 
     return result;
   }
+  
+  /** Expert: return an explanation for the TF component of the score. */
+  protected Explanation explainTF(IndexReader reader, int doc) throws IOException {
+    return ((SpanScorer)scorer(reader, true, false)).explain(doc);
+  }
 }
Index: lucene/src/java/org/apache/lucene/search/spans/SpanTermQuery.java
===================================================================
--- lucene/src/java/org/apache/lucene/search/spans/SpanTermQuery.java	(revision 1039149)
+++ lucene/src/java/org/apache/lucene/search/spans/SpanTermQuery.java	(working copy)
@@ -17,9 +17,16 @@
  * limitations under the License.
  */
 
+import org.apache.lucene.index.DocsEnum;
 import org.apache.lucene.index.IndexReader;
 import org.apache.lucene.index.Term;
 import org.apache.lucene.index.DocsAndPositionsEnum;
+import org.apache.lucene.search.Explanation;
+import org.apache.lucene.search.Scorer;
+import org.apache.lucene.search.Searcher;
+import org.apache.lucene.search.SimilarityDelegator;
+import org.apache.lucene.search.TermScorer;
+import org.apache.lucene.search.Weight;
 import org.apache.lucene.util.ToStringUtils;
 
 import java.io.IOException;
@@ -97,4 +104,47 @@
       }
     }
   }
+  
+  @Override
+  public Weight createWeight(Searcher searcher) throws IOException {
+    return new SpanWeight(this, searcher) {
+      @Override
+      public Scorer scorer(IndexReader reader, boolean scoreDocsInOrder, boolean topScorer) throws IOException {
+        DocsEnum docs = reader.termDocsEnum(reader.getDeletedDocs(),
+            term.field(),
+            term.bytes());
+
+        if (docs == null) {
+          return null;
+        }
+
+        return new TermScorer(this, docs, new SimilarityDelegator(similarity) {
+          @Override
+          public float tf(float freq) {
+            return super.tf(freq*sloppyFreq(1));
+          }
+        }, reader.norms(term.field()));
+      }
+
+      @Override
+      protected Explanation explainTF(IndexReader reader, int doc) throws IOException {
+        Explanation tfExplanation = new Explanation();
+        int tf = 0;
+        DocsEnum docs = reader.termDocsEnum(reader.getDeletedDocs(), term.field(), term.bytes());
+        if (docs != null) {
+            int newDoc = docs.advance(doc);
+            if (newDoc == doc) {
+              tf = docs.freq();
+            }
+        }
+        
+        float phraseFreq = similarity.sloppyFreq(1) * tf;
+
+        tfExplanation.setValue(similarity.tf(phraseFreq));
+        tfExplanation.setDescription("tf(phraseFreq=" + phraseFreq + ")");
+
+        return tfExplanation;
+      }
+    };
+  }
 }
Index: lucene/src/java/org/apache/lucene/search/TermScorer.java
===================================================================
--- lucene/src/java/org/apache/lucene/search/TermScorer.java	(revision 1039149)
+++ lucene/src/java/org/apache/lucene/search/TermScorer.java	(working copy)
@@ -23,8 +23,9 @@
 import org.apache.lucene.search.BooleanClause.Occur;
 
 /** Expert: A <code>Scorer</code> for documents matching a <code>Term</code>.
+ * @lucene.internal
  */
-final class TermScorer extends Scorer {
+public final class TermScorer extends Scorer {
   private DocsEnum docsEnum;
   private byte[] norms;
   private float weightValue;
@@ -53,7 +54,7 @@
    * @param norms
    *          The field norms of the document fields for the <code>Term</code>.
    */
-  TermScorer(Weight weight, DocsEnum td, Similarity similarity, byte[] norms) {
+  public TermScorer(Weight weight, DocsEnum td, Similarity similarity, byte[] norms) {
     super(similarity, weight);
     
     this.docsEnum = td;