diff --git a/mercurial/cmdutil.py b/mercurial/cmdutil.py
--- a/mercurial/cmdutil.py
+++ b/mercurial/cmdutil.py
@@ -708,15 +708,15 @@ class changeset_printer(object):
         if self.footer:
             self.ui.write(self.footer)
 
-    def show(self, ctx, copies=None, **props):
+    def show(self, ctx, copies=None, matchfn=None, **props):
         if self.buffered:
             self.ui.pushbuffer()
-            self._show(ctx, copies, props)
+            self._show(ctx, copies, matchfn, props)
             self.hunk[ctx.rev()] = self.ui.popbuffer(labeled=True)
         else:
-            self._show(ctx, copies, props)
+            self._show(ctx, copies, matchfn, props)
 
-    def _show(self, ctx, copies, props):
+    def _show(self, ctx, copies, matchfn, props):
         '''show a single changeset or file revision'''
         changenode = ctx.node()
         rev = ctx.rev()
@@ -796,15 +796,17 @@ class changeset_printer(object):
                               label='log.summary')
         self.ui.write("\n")
 
-        self.showpatch(changenode)
+        self.showpatch(changenode, matchfn)
 
-    def showpatch(self, node):
-        if self.patch:
+    def showpatch(self, node, matchfn):
+        if not matchfn:
+            matchfn = self.patch
+        if matchfn:
             stat = self.diffopts.get('stat')
             diffopts = patch.diffopts(self.ui, self.diffopts)
             prev = self.repo.changelog.parents(node)[0]
             diffordiffstat(self.ui, self.repo, diffopts, prev, node,
-                           match=self.patch, stat=stat)
+                           match=matchfn, stat=stat)
             self.ui.write("\n")
 
     def _meaningful_parentrevs(self, log, rev):
@@ -857,7 +859,7 @@ class changeset_templater(changeset_prin
             return []
         return parents
 
-    def _show(self, ctx, copies, props):
+    def _show(self, ctx, copies, matchfn, props):
         '''show a single changeset or file revision'''
 
         showlist = templatekw.showlist
@@ -912,7 +914,7 @@ class changeset_templater(changeset_prin
             # write changeset metadata, then patch if requested
             key = types['changeset']
             self.ui.write(templater.stringify(self.t(key, **props)))
-            self.showpatch(ctx.node())
+            self.showpatch(ctx.node(), matchfn)
 
             if types['footer']:
                 if not self.footer:
@@ -925,7 +927,7 @@ class changeset_templater(changeset_prin
         except SyntaxError, inst:
             raise util.Abort('%s: %s' % (self.t.mapfile, inst.args[0]))
 
-def show_changeset(ui, repo, opts, buffered=False, matchfn=False):
+def show_changeset(ui, repo, opts, buffered=False):
     """show one changeset using template or regular display.
 
     Display format will be the first non-empty hit of:
@@ -939,7 +941,7 @@ def show_changeset(ui, repo, opts, buffe
     # options
     patch = False
     if opts.get('patch') or opts.get('stat'):
-        patch = matchfn or matchall(repo)
+        patch = matchall(repo)
 
     tmpl = opts.get('template')
     style = None
diff --git a/mercurial/commands.py b/mercurial/commands.py
--- a/mercurial/commands.py
+++ b/mercurial/commands.py
@@ -2484,7 +2484,7 @@ def log(ui, repo, *pats, **opts):
     branches = opts.get('branch', []) + opts.get('only_branch', [])
     opts['branch'] = [repo.lookupbranch(b) for b in branches]
 
-    displayer = cmdutil.show_changeset(ui, repo, opts, True, matchfn)
+    displayer = cmdutil.show_changeset(ui, repo, opts, True)
     def prep(ctx, fns):
         rev = ctx.rev()
         parents = [p for p in repo.changelog.parentrevs(rev)
@@ -2517,7 +2517,11 @@ def log(ui, repo, *pats, **opts):
                 if rename:
                     copies.append((fn, rename[0]))
 
-        displayer.show(ctx, copies=copies)
+        revmatchfn = None
+        if opts.get('patch') or opts.get('stat'):
+            revmatchfn = cmdutil.match(repo, fns)
+
+        displayer.show(ctx, copies=copies, matchfn=revmatchfn)
 
     for ctx in cmdutil.walkchangerevs(repo, matchfn, opts, prep):
         if count == limit: