diff --git a/go/ast/astutil/imports.go b/go/ast/astutil/imports.go
index 04ad679..3e4b195 100644
--- a/go/ast/astutil/imports.go
+++ b/go/ast/astutil/imports.go
@@ -14,26 +14,26 @@
 )
 
 // AddImport adds the import path to the file f, if absent.
-func AddImport(fset *token.FileSet, f *ast.File, ipath string) (added bool) {
-	return AddNamedImport(fset, f, "", ipath)
+func AddImport(fset *token.FileSet, f *ast.File, path string) (added bool) {
+	return AddNamedImport(fset, f, "", path)
 }
 
-// AddNamedImport adds the import path to the file f, if absent.
+// AddNamedImport adds the import with the given name and path to the file f, if absent.
 // If name is not empty, it is used to rename the import.
 //
 // For example, calling
 //	AddNamedImport(fset, f, "pathpkg", "path")
 // adds
 //	import pathpkg "path"
-func AddNamedImport(fset *token.FileSet, f *ast.File, name, ipath string) (added bool) {
-	if imports(f, ipath) {
+func AddNamedImport(fset *token.FileSet, f *ast.File, name, path string) (added bool) {
+	if imports(f, name, path) {
 		return false
 	}
 
 	newImport := &ast.ImportSpec{
 		Path: &ast.BasicLit{
 			Kind:  token.STRING,
-			Value: strconv.Quote(ipath),
+			Value: strconv.Quote(path),
 		},
 	}
 	if name != "" {
@@ -43,14 +43,14 @@
 	// Find an import decl to add to.
 	// The goal is to find an existing import
 	// whose import path has the longest shared
-	// prefix with ipath.
+	// prefix with path.
 	var (
 		bestMatch  = -1         // length of longest shared prefix
 		lastImport = -1         // index in f.Decls of the file's final import decl
 		impDecl    *ast.GenDecl // import decl containing the best match
 		impIndex   = -1         // spec index in impDecl containing the best match
 
-		isThirdPartyPath = isThirdParty(ipath)
+		isThirdPartyPath = isThirdParty(path)
 	)
 	for i, decl := range f.Decls {
 		gen, ok := decl.(*ast.GenDecl)
@@ -81,7 +81,7 @@
 			for j, spec := range gen.Specs {
 				impspec := spec.(*ast.ImportSpec)
 				p := importPath(impspec)
-				n := matchLen(p, ipath)
+				n := matchLen(p, path)
 				if n > bestMatch || (bestMatch == 0 && !seenAnyThirdParty && isThirdPartyPath) {
 					bestMatch = n
 					impDecl = gen
@@ -197,11 +197,13 @@
 }
 
 // DeleteImport deletes the import path from the file f, if present.
+// If there are duplicate import declarations, all matching ones are deleted.
 func DeleteImport(fset *token.FileSet, f *ast.File, path string) (deleted bool) {
 	return DeleteNamedImport(fset, f, "", path)
 }
 
 // DeleteNamedImport deletes the import with the given name and path from the file f, if present.
+// If there are duplicate import declarations, all matching ones are deleted.
 func DeleteNamedImport(fset *token.FileSet, f *ast.File, name, path string) (deleted bool) {
 	var delspecs []*ast.ImportSpec
 	var delcomments []*ast.CommentGroup
@@ -216,13 +218,7 @@
 		for j := 0; j < len(gen.Specs); j++ {
 			spec := gen.Specs[j]
 			impspec := spec.(*ast.ImportSpec)
-			if impspec.Name == nil && name != "" {
-				continue
-			}
-			if impspec.Name != nil && impspec.Name.Name != name {
-				continue
-			}
-			if importPath(impspec) != path {
+			if importName(impspec) != name || importPath(impspec) != path {
 				continue
 			}
 
@@ -383,9 +379,14 @@
 	return fn
 }
 
-// imports returns true if f imports path.
-func imports(f *ast.File, path string) bool {
-	return importSpec(f, path) != nil
+// imports reports whether f has an import with the specified name and path.
+func imports(f *ast.File, name, path string) bool {
+	for _, s := range f.Imports {
+		if importName(s) == name && importPath(s) == path {
+			return true
+		}
+	}
+	return false
 }
 
 // importSpec returns the import spec if f imports path,
@@ -399,14 +400,23 @@
 	return nil
 }
 
+// importName returns the name of s,
+// or "" if the import is not named.
+func importName(s *ast.ImportSpec) string {
+	if s.Name == nil {
+		return ""
+	}
+	return s.Name.Name
+}
+
 // importPath returns the unquoted import path of s,
 // or "" if the path is not properly quoted.
 func importPath(s *ast.ImportSpec) string {
 	t, err := strconv.Unquote(s.Path.Value)
-	if err == nil {
-		return t
+	if err != nil {
+		return ""
 	}
-	return ""
+	return t
 }
 
 // declImports reports whether gen contains an import of path.
diff --git a/go/ast/astutil/imports_test.go b/go/ast/astutil/imports_test.go
index da775ef..1d86e47 100644
--- a/go/ast/astutil/imports_test.go
+++ b/go/ast/astutil/imports_test.go
@@ -30,7 +30,7 @@
 	if err := format.Node(&buf, fset, f); err != nil {
 		t.Fatalf("%s gofmt: %v", name, err)
 	}
-	return string(buf.Bytes())
+	return buf.String()
 }
 
 type test struct {
@@ -39,7 +39,7 @@
 	pkg        string
 	in         string
 	out        string
-	broken     bool // known broken
+	unchanged  bool // Expect added/deleted return value to be false.
 }
 
 var addTests = []test{
@@ -58,6 +58,7 @@
 	"os"
 )
 `,
+		unchanged: true,
 	},
 	{
 		name: "import.1",
@@ -657,6 +658,117 @@
 )
 `,
 	},
+
+	// Issue 28605: Add specified import, even if that import path is imported under another name
+	{
+		name:       "issue 28605 add unnamed path",
+		renamedPkg: "",
+		pkg:        "path",
+		in: `package main
+
+import (
+	. "path"
+	_ "path"
+	pathpkg "path"
+)
+`,
+		out: `package main
+
+import (
+	"path"
+	. "path"
+	_ "path"
+	pathpkg "path"
+)
+`,
+	},
+	{
+		name:       "issue 28605 add pathpkg-renamed path",
+		renamedPkg: "pathpkg",
+		pkg:        "path",
+		in: `package main
+
+import (
+	"path"
+	. "path"
+	_ "path"
+)
+`,
+		out: `package main
+
+import (
+	"path"
+	. "path"
+	_ "path"
+	pathpkg "path"
+)
+`,
+	},
+	{
+		name:       "issue 28605 add blank identifier path",
+		renamedPkg: "_",
+		pkg:        "path",
+		in: `package main
+
+import (
+	"path"
+	. "path"
+	pathpkg "path"
+)
+`,
+		out: `package main
+
+import (
+	"path"
+	. "path"
+	_ "path"
+	pathpkg "path"
+)
+`,
+	},
+	{
+		name:       "issue 28605 add dot import path",
+		renamedPkg: ".",
+		pkg:        "path",
+		in: `package main
+
+import (
+	"path"
+	_ "path"
+	pathpkg "path"
+)
+`,
+		out: `package main
+
+import (
+	"path"
+	. "path"
+	_ "path"
+	pathpkg "path"
+)
+`,
+	},
+
+	{
+		name:       "duplicate import declarations, add existing one",
+		renamedPkg: "f",
+		pkg:        "fmt",
+		in: `package main
+
+import "fmt"
+import "fmt"
+import f "fmt"
+import f "fmt"
+`,
+		out: `package main
+
+import "fmt"
+import "fmt"
+import f "fmt"
+import f "fmt"
+`,
+		unchanged: true,
+	},
 }
 
 func TestAddImport(t *testing.T) {
@@ -664,18 +776,26 @@
 		file := parse(t, test.name, test.in)
 		var before bytes.Buffer
 		ast.Fprint(&before, fset, file, nil)
-		AddNamedImport(fset, file, test.renamedPkg, test.pkg)
+		added := AddNamedImport(fset, file, test.renamedPkg, test.pkg)
 		if got := print(t, test.name, file); got != test.out {
-			if test.broken {
-				t.Logf("%s is known broken:\ngot: %s\nwant: %s", test.name, got, test.out)
-			} else {
-				t.Errorf("%s:\ngot: %s\nwant: %s", test.name, got, test.out)
-			}
+			t.Errorf("first run: %s:\ngot: %s\nwant: %s", test.name, got, test.out)
 			var after bytes.Buffer
 			ast.Fprint(&after, fset, file, nil)
-
 			t.Logf("AST before:\n%s\nAST after:\n%s\n", before.String(), after.String())
 		}
+		if got, want := added, !test.unchanged; got != want {
+			t.Errorf("first run: %s: added = %v, want %v", test.name, got, want)
+		}
+
+		// AddNamedImport should be idempotent. Verify that by calling it again,
+		// expecting no change to the AST, and the returned added value to always be false.
+		added = AddNamedImport(fset, file, test.renamedPkg, test.pkg)
+		if got := print(t, test.name, file); got != test.out {
+			t.Errorf("second run: %s:\ngot: %s\nwant: %s", test.name, got, test.out)
+		}
+		if got, want := added, false; got != want {
+			t.Errorf("second run: %s: added = %v, want %v", test.name, got, want)
+		}
 	}
 }
 
@@ -1405,14 +1525,161 @@
 )
 `,
 	},
+
+	// Issue 28605: Delete specified import, even if that import path is imported under another name
+	{
+		name:       "import.38",
+		renamedPkg: "",
+		pkg:        "path",
+		in: `package main
+
+import (
+	"path"
+	. "path"
+	_ "path"
+	pathpkg "path"
+)
+`,
+		out: `package main
+
+import (
+	. "path"
+	_ "path"
+	pathpkg "path"
+)
+`,
+	},
+	{
+		name:       "import.39",
+		renamedPkg: "pathpkg",
+		pkg:        "path",
+		in: `package main
+
+import (
+	"path"
+	. "path"
+	_ "path"
+	pathpkg "path"
+)
+`,
+		out: `package main
+
+import (
+	"path"
+	. "path"
+	_ "path"
+)
+`,
+	},
+	{
+		name:       "import.40",
+		renamedPkg: "_",
+		pkg:        "path",
+		in: `package main
+
+import (
+	"path"
+	. "path"
+	_ "path"
+	pathpkg "path"
+)
+`,
+		out: `package main
+
+import (
+	"path"
+	. "path"
+	pathpkg "path"
+)
+`,
+	},
+	{
+		name:       "import.41",
+		renamedPkg: ".",
+		pkg:        "path",
+		in: `package main
+
+import (
+	"path"
+	. "path"
+	_ "path"
+	pathpkg "path"
+)
+`,
+		out: `package main
+
+import (
+	"path"
+	_ "path"
+	pathpkg "path"
+)
+`,
+	},
+
+	// Duplicate import declarations, all matching ones are deleted.
+	{
+		name:       "import.42",
+		renamedPkg: "f",
+		pkg:        "fmt",
+		in: `package main
+
+import "fmt"
+import "fmt"
+import f "fmt"
+import f "fmt"
+`,
+		out: `package main
+
+import "fmt"
+import "fmt"
+`,
+	},
+	{
+		name:       "import.43",
+		renamedPkg: "x",
+		pkg:        "fmt",
+		in: `package main
+
+import "fmt"
+import "fmt"
+import f "fmt"
+import f "fmt"
+`,
+		out: `package main
+
+import "fmt"
+import "fmt"
+import f "fmt"
+import f "fmt"
+`,
+		unchanged: true,
+	},
 }
 
 func TestDeleteImport(t *testing.T) {
 	for _, test := range deleteTests {
 		file := parse(t, test.name, test.in)
-		DeleteNamedImport(fset, file, test.renamedPkg, test.pkg)
+		var before bytes.Buffer
+		ast.Fprint(&before, fset, file, nil)
+		deleted := DeleteNamedImport(fset, file, test.renamedPkg, test.pkg)
 		if got := print(t, test.name, file); got != test.out {
-			t.Errorf("%s:\ngot: %s\nwant: %s", test.name, got, test.out)
+			t.Errorf("first run: %s:\ngot: %s\nwant: %s", test.name, got, test.out)
+			var after bytes.Buffer
+			ast.Fprint(&after, fset, file, nil)
+			t.Logf("AST before:\n%s\nAST after:\n%s\n", before.String(), after.String())
+		}
+		if got, want := deleted, !test.unchanged; got != want {
+			t.Errorf("first run: %s: deleted = %v, want %v", test.name, got, want)
+		}
+
+		// DeleteNamedImport should be idempotent. Verify that by calling it again,
+		// expecting no change to the AST, and the returned deleted value to always be false.
+		deleted = DeleteNamedImport(fset, file, test.renamedPkg, test.pkg)
+		if got := print(t, test.name, file); got != test.out {
+			t.Errorf("second run: %s:\ngot: %s\nwant: %s", test.name, got, test.out)
+		}
+		if got, want := deleted, false; got != want {
+			t.Errorf("second run: %s: deleted = %v, want %v", test.name, got, want)
 		}
 	}
 }