diff --git a/GPU/Software/RasterizerRectangle.cpp b/GPU/Software/RasterizerRectangle.cpp
index 93f46b11b5..dd295243c0 100644
--- a/GPU/Software/RasterizerRectangle.cpp
+++ b/GPU/Software/RasterizerRectangle.cpp
@@ -595,6 +595,13 @@ static bool AreCoordsRectangleCompatible(const RasterizerState &state, const Cli
 	return true;
 }
 
+// A rectangle drawn as triangles samples pixel centers, so its first column is (x + 7) >> 4; a sprite's
+// is (x + 6) >> 4 (gpu/probe exp30). They differ only for a left edge at 9/16 into a pixel, where the
+// triangles must stay triangles (NBA 2K13's menu boxes). Rows and the far edges agree.
+bool RectangleCoverageMatchesTriangles(const VertexData &a, const VertexData &b) {
+	return (std::min(a.screenpos.x, b.screenpos.x) & (SCREEN_SCALE_FACTOR - 1)) != 9;
+}
+
 bool DetectRectangleFromStrip(const RasterizerState &state, const ClipVertexData data[4], int *tlIndex, int *brIndex) {
 	if (!IsCoordRectangleCompatible(state, data[0]))
 		return false;
diff --git a/GPU/Software/RasterizerRectangle.h b/GPU/Software/RasterizerRectangle.h
index 49f2e61c93..172c53ce0a 100644
--- a/GPU/Software/RasterizerRectangle.h
+++ b/GPU/Software/RasterizerRectangle.h
@@ -24,4 +24,5 @@ namespace Rasterizer {
 	bool DetectRectangleFromFan(const RasterizerState &state, const ClipVertexData *data, int *tlIndex, int *brIndex);
 	bool DetectRectangleFromPair(const RasterizerState &state, const ClipVertexData data[6], int *tlIndex, int *brIndex);
 	bool DetectRectangleThroughModeSlices(const RasterizerState &state, const ClipVertexData data[4]);
+	bool RectangleCoverageMatchesTriangles(const VertexData &a, const VertexData &b);
 }
diff --git a/GPU/Software/TransformUnit.cpp b/GPU/Software/TransformUnit.cpp
index cab09aa424..1ae3731a8f 100644
--- a/GPU/Software/TransformUnit.cpp
+++ b/GPU/Software/TransformUnit.cpp
@@ -1025,7 +1025,7 @@ void TransformUnit::SubmitPrimitive(const void* vertices, const void* indices, G
 				continue;
 
 			int tl = -1, br = -1;
-			if (Rasterizer::DetectRectangleFromPair(binner_->State(), buf, &tl, &br)) {
+			if (Rasterizer::DetectRectangleFromPair(binner_->State(), buf, &tl, &br) && Rasterizer::RectangleCoverageMatchesTriangles(buf[tl].v, buf[br].v)) {
 				Clipper::ProcessRect(buf[tl], buf[br], *binner_);
 			} else {
 				SendTriangle(cullType, &buf[0]);
@@ -1159,7 +1159,7 @@ void TransformUnit::SubmitPrimitive(const void* vertices, const void* indices, G
 
 					// If a strip is effectively a rectangle, draw it as such!
 					int tl = -1, br = -1;
-					if (Rasterizer::DetectRectangleFromStrip(binner_->State(), data_, &tl, &br)) {
+					if (Rasterizer::DetectRectangleFromStrip(binner_->State(), data_, &tl, &br) && Rasterizer::RectangleCoverageMatchesTriangles(data_[tl].v, data_[br].v)) {
 						Clipper::ProcessRect(data_[tl], data_[br], *binner_);
 						start_vtx += 2;
 						skip_count = 2;
@@ -1228,7 +1228,7 @@ void TransformUnit::SubmitPrimitive(const void* vertices, const void* indices, G
 				}
 
 				int tl = -1, br = -1;
-				if (Rasterizer::DetectRectangleFromFan(binner_->State(), data_, &tl, &br)) {
+				if (Rasterizer::DetectRectangleFromFan(binner_->State(), data_, &tl, &br) && Rasterizer::RectangleCoverageMatchesTriangles(data_[tl].v, data_[br].v)) {
 					Clipper::ProcessRect(data_[tl], data_[br], *binner_);
 					break;
 				}