diff --git a/RELEASENOTES.md b/RELEASENOTES.md
index 2f6b60f65d4..b20946d0003 100644
--- a/RELEASENOTES.md
+++ b/RELEASENOTES.md
@@ -97,6 +97,8 @@
       ([#3676](https://github.com/google/ExoPlayer/issues/3676)).
     * Fix handling of ad tags where ad groups are out of order
       ([#3716](https://github.com/google/ExoPlayer/issues/3716)).
+    * Fix handling of ad tags with only preroll/postroll ad groups
+      ([#3715](https://github.com/google/ExoPlayer/issues/3715)).
     * Propagate ad media preparation errors to IMA so that the ads can be
       skipped.
 * `EventLogger` moved from the demo app into the core library.
diff --git a/extensions/ima/src/main/java/com/google/android/exoplayer2/ext/ima/ImaAdsLoader.java b/extensions/ima/src/main/java/com/google/android/exoplayer2/ext/ima/ImaAdsLoader.java
index d11bc920e18..0a79acb6179 100644
--- a/extensions/ima/src/main/java/com/google/android/exoplayer2/ext/ima/ImaAdsLoader.java
+++ b/extensions/ima/src/main/java/com/google/android/exoplayer2/ext/ima/ImaAdsLoader.java
@@ -851,15 +851,14 @@ private void startAdPlayback() {
     adsRenderingSettings.setMimeTypes(supportedMimeTypes);
 
     // Set up the ad playback state, skipping ads based on the start position as required.
-    pendingContentPositionMs = player.getCurrentPosition();
     long[] adGroupTimesUs = getAdGroupTimesUs(adsManager.getAdCuePoints());
     adPlaybackState = new AdPlaybackState(adGroupTimesUs);
+    long contentPositionMs = player.getCurrentPosition();
     int adGroupIndexForPosition =
-        adPlaybackState.getAdGroupIndexForPositionUs(C.msToUs(pendingContentPositionMs));
+        adPlaybackState.getAdGroupIndexForPositionUs(C.msToUs(contentPositionMs));
     if (adGroupIndexForPosition == 0) {
       podIndexOffset = 0;
     } else if (adGroupIndexForPosition == C.INDEX_UNSET) {
-      pendingContentPositionMs = C.TIME_UNSET;
       // There is no preroll and midroll pod indices start at 1.
       podIndexOffset = -1;
     } else /* adGroupIndexForPosition > 0 */ {
@@ -879,6 +878,11 @@ private void startAdPlayback() {
       podIndexOffset = adGroupIndexForPosition - 1;
     }
 
+    if (hasMidrollAdGroups(adGroupTimesUs)) {
+      // IMA will poll the content position, so provide the player's initial position like a seek.
+      pendingContentPositionMs = contentPositionMs;
+    }
+
     // Start ad playback.
     adsManager.init(adsRenderingSettings);
     updateAdPlaybackState();
@@ -1051,4 +1055,16 @@ private static boolean isAdGroupLoadError(AdError adError) {
     // a single ad, ad group or the whole timeline.
     return adError.getErrorCode() == AdErrorCode.VAST_LINEAR_ASSET_MISMATCH;
   }
+
+  private static boolean hasMidrollAdGroups(long[] adGroupTimesUs) {
+    int count = adGroupTimesUs.length;
+    if (count == 1) {
+      return adGroupTimesUs[0] != 0 && adGroupTimesUs[0] != C.TIME_END_OF_SOURCE;
+    } else if (count == 2) {
+      return adGroupTimesUs[0] != 0 || adGroupTimesUs[1] != C.TIME_END_OF_SOURCE;
+    } else {
+      // There's at least one midroll ad group, as adGroupTimesUs is never empty.
+      return true;
+    }
+  }
 }