diff --git a/pip/req.py b/pip/req.py
index dbe7af27b7f..16c3cff6abc 100644
--- a/pip/req.py
+++ b/pip/req.py
@@ -107,7 +107,7 @@ def from_line(cls, name, comes_from=None):
         # Otherwise, assume the name is the req for the non URL/path/archive case.
         if link and req is None:
             url = link.url_without_fragment
-            req = link.egg_fragment
+            req = link.egg_fragment  #when fragment is None, this will become an 'unnamed' requirement
 
             # Handle relative file URLs
             if link.scheme == 'file' and re.search(r'\.\./', url):
@@ -843,6 +843,7 @@ def add_requirement(self, install_req):
         install_req.as_egg = self.as_egg
         install_req.use_user_site = self.use_user_site
         if not name:
+            #url or path requirement w/o an egg fragment
             self.unnamed_requirements.append(install_req)
         else:
             if self.has_requirement(name):
@@ -1094,8 +1095,9 @@ def prepare_files(self, finder, force_root_egg_info=False, bundle=False):
                             subreq = InstallRequirement(req, req_to_install)
                             reqs.append(subreq)
                             self.add_requirement(subreq)
-                    if req_to_install.name not in self.requirements:
-                        self.requirements[req_to_install.name] = req_to_install
+                    if not self.has_requirement(req_to_install.name):
+                        #'unnamed' requirements will get added here
+                        self.add_requirement(req_to_install)
                     if self.is_download or req_to_install._temp_build_dir is not None:
                         self.reqs_to_cleanup.append(req_to_install)
                 else:
diff --git a/tests/packages/README.txt b/tests/packages/README.txt
index 0d25eb59d91..fdf925d6e96 100644
--- a/tests/packages/README.txt
+++ b/tests/packages/README.txt
@@ -62,6 +62,11 @@ simple-[123].0.tar.gz
 ---------------------
 contains "simple" package; good for basic testing and version logic.
 
+Upper-[12].0.tar.gz and requiresuppper-1.0.tar.gz
+--------------------------------------------------
+'requiresupper' requires 'upper'
+used for testing case mismatch case for url requirements
+
 
 
 
diff --git a/tests/packages/Upper-1.0.tar.gz b/tests/packages/Upper-1.0.tar.gz
new file mode 100644
index 00000000000..e0d28fdc762
Binary files /dev/null and b/tests/packages/Upper-1.0.tar.gz differ
diff --git a/tests/packages/Upper-2.0.tar.gz b/tests/packages/Upper-2.0.tar.gz
new file mode 100644
index 00000000000..81ff441daa6
Binary files /dev/null and b/tests/packages/Upper-2.0.tar.gz differ
diff --git a/tests/packages/requiresupper-1.0.tar.gz b/tests/packages/requiresupper-1.0.tar.gz
new file mode 100644
index 00000000000..fe121a90f23
Binary files /dev/null and b/tests/packages/requiresupper-1.0.tar.gz differ
diff --git a/tests/test_requirements.py b/tests/test_requirements.py
index 47a274824cc..a21478ac6e3 100644
--- a/tests/test_requirements.py
+++ b/tests/test_requirements.py
@@ -184,3 +184,26 @@ def test_install_local_editable_with_extras():
     assert env.site_packages/'easy-install.pth' in res.files_updated
     assert env.site_packages/'LocalExtras.egg-link' in res.files_created
     assert env.site_packages/'simple' in res.files_created
+
+
+def test_url_req_case_mismatch():
+    """
+    tar ball url requirements (with no egg fragment), that happen to have upper case project names,
+    should be considered equal to later requirements that reference the project name using lower case.
+
+    tests/packages contains Upper-1.0.tar.gz and Upper-2.0.tar.gz
+    'requiresupper' has install_requires = ['upper']
+    """
+    env = reset_env()
+    find_links = 'file://' + os.path.join(here, 'packages')
+    Upper = os.path.join(find_links, 'Upper-1.0.tar.gz')
+    result = run_pip('install', '--no-index', '-f', find_links, Upper, 'requiresupper')
+
+    #only Upper-1.0.tar.gz should get installed.
+    egg_folder = env.site_packages / 'Upper-1.0-py%s.egg-info' % pyversion
+    assert egg_folder in result.files_created, str(result)
+    egg_folder = env.site_packages / 'Upper-2.0-py%s.egg-info' % pyversion
+    assert egg_folder not in result.files_created, str(result)
+
+
+