diff --git a/core/src/main/scala/org/apache/spark/Partitioner.scala b/core/src/main/scala/org/apache/spark/Partitioner.scala
index ad9988226470c..9155159cf6aeb 100644
--- a/core/src/main/scala/org/apache/spark/Partitioner.scala
+++ b/core/src/main/scala/org/apache/spark/Partitioner.scala
@@ -89,12 +89,14 @@ class HashPartitioner(partitions: Int) extends Partitioner {
  * A [[org.apache.spark.Partitioner]] that partitions sortable records by range into roughly
  * equal ranges. The ranges are determined by sampling the content of the RDD passed in.
  */
-class RangePartitioner[K <% Ordered[K]: ClassTag, V](
+class RangePartitioner[K : Ordering : ClassTag, V](
     partitions: Int,
     @transient rdd: RDD[_ <: Product2[K,V]],
     private val ascending: Boolean = true)
   extends Partitioner {
 
+  private val ordering = implicitly[Ordering[K]]
+
   // An array of upper bounds for the first (partitions - 1) partitions
   private val rangeBounds: Array[K] = {
     if (partitions == 1) {
@@ -103,7 +105,7 @@ class RangePartitioner[K <% Ordered[K]: ClassTag, V](
       val rddSize = rdd.count()
       val maxSampleSize = partitions * 20.0
       val frac = math.min(maxSampleSize / math.max(rddSize, 1), 1.0)
-      val rddSample = rdd.sample(false, frac, 1).map(_._1).collect().sortWith(_ < _)
+      val rddSample = rdd.sample(false, frac, 1).map(_._1).collect().sorted
       if (rddSample.length == 0) {
         Array()
       } else {
@@ -126,7 +128,7 @@ class RangePartitioner[K <% Ordered[K]: ClassTag, V](
     var partition = 0
     if (rangeBounds.length < 1000) {
       // If we have less than 100 partitions naive search
-      while (partition < rangeBounds.length && k > rangeBounds(partition)) {
+      while (partition < rangeBounds.length && ordering.gt(k, rangeBounds(partition))) {
         partition += 1
       }
     } else {
diff --git a/core/src/main/scala/org/apache/spark/SparkContext.scala b/core/src/main/scala/org/apache/spark/SparkContext.scala
index 456070fa7c5ef..e7bd18fdef7a5 100644
--- a/core/src/main/scala/org/apache/spark/SparkContext.scala
+++ b/core/src/main/scala/org/apache/spark/SparkContext.scala
@@ -1267,7 +1267,7 @@ object SparkContext extends Logging {
       rdd: RDD[(K, V)]) =
     new SequenceFileRDDFunctions(rdd)
 
-  implicit def rddToOrderedRDDFunctions[K <% Ordered[K]: ClassTag, V: ClassTag](
+  implicit def rddToOrderedRDDFunctions[K : Ordering : ClassTag, V: ClassTag](
       rdd: RDD[(K, V)]) =
     new OrderedRDDFunctions[K, V, (K, V)](rdd)
 
diff --git a/core/src/main/scala/org/apache/spark/rdd/OrderedRDDFunctions.scala b/core/src/main/scala/org/apache/spark/rdd/OrderedRDDFunctions.scala
index d5691f2267bfa..8397d0a20629f 100644
--- a/core/src/main/scala/org/apache/spark/rdd/OrderedRDDFunctions.scala
+++ b/core/src/main/scala/org/apache/spark/rdd/OrderedRDDFunctions.scala
@@ -27,12 +27,14 @@ import org.apache.spark.{Logging, RangePartitioner}
  * use these functions. They will work with any key type that has a `scala.math.Ordered`
  * implementation.
  */
-class OrderedRDDFunctions[K <% Ordered[K]: ClassTag,
+class OrderedRDDFunctions[K : Ordering : ClassTag,
                           V: ClassTag,
                           P <: Product2[K, V] : ClassTag](
     self: RDD[P])
   extends Logging with Serializable {
 
+  private val ordering = implicitly[Ordering[K]]
+
   /**
    * Sort the RDD by key, so that each partition contains a sorted range of the elements. Calling
    * `collect` or `save` on the resulting RDD will return or output an ordered list of records
@@ -45,9 +47,9 @@ class OrderedRDDFunctions[K <% Ordered[K]: ClassTag,
     shuffled.mapPartitions(iter => {
       val buf = iter.toArray
       if (ascending) {
-        buf.sortWith((x, y) => x._1 < y._1).iterator
+        buf.sortWith((x, y) => ordering.lt(x._1, y._1)).iterator
       } else {
-        buf.sortWith((x, y) => x._1 > y._1).iterator
+        buf.sortWith((x, y) => ordering.gt(x._1, y._1)).iterator
       }
     }, preservesPartitioning = true)
   }
diff --git a/core/src/main/scala/org/apache/spark/util/CollectionsUtil.scala b/core/src/main/scala/org/apache/spark/util/CollectionsUtil.scala
index 93235031f3ad5..e4c254b9dd6b9 100644
--- a/core/src/main/scala/org/apache/spark/util/CollectionsUtil.scala
+++ b/core/src/main/scala/org/apache/spark/util/CollectionsUtil.scala
@@ -23,7 +23,7 @@ import scala.Array
 import scala.reflect._
 
 private[spark] object CollectionsUtils {
-  def makeBinarySearch[K <% Ordered[K] : ClassTag] : (Array[K], K) => Int = {
+  def makeBinarySearch[K : Ordering : ClassTag] : (Array[K], K) => Int = {
     classTag[K] match {
       case ClassTag.Float =>
         (l, x) => util.Arrays.binarySearch(l.asInstanceOf[Array[Float]], x.asInstanceOf[Float])