diff --git a/benchmarks.md b/benchmarks.md
index 2137c25..17c149d 100644
--- a/benchmarks.md
+++ b/benchmarks.md
@@ -4,20 +4,22 @@
 ┌─────────────────────────────────────────────────────┬────────────────┬─────────┐
 │ name                                                │ ops/sec        │ samples │
 ├─────────────────────────────────────────────────────┼────────────────┼─────────┤
-│ create                                              │ 393 (±70.95%)  │ 56      │
+│ create                                              │ 641 (±14.07%)  │ 45      │
 ├─────────────────────────────────────────────────────┼────────────────┼─────────┤
-│ file -> debounce                                    │ 925 (±6.47%)   │ 51      │
+│ file -> debounce                                    │ 804 (±9.85%)   │ 46      │
 ├─────────────────────────────────────────────────────┼────────────────┼─────────┤
-│ file -> combine(sum3, [a, b, c]) -> reduce(sum2, 0) │ 85,217 (±4.7%) │ 61      │
+│ file -> combine(sum3, [a, b, c]) -> reduce(sum2, 0) │ 88,588 (±3.7%) │ 69      │
 ├─────────────────────────────────────────────────────┼────────────────┼─────────┤
-│ file -> map -> reduce                               │ 57 (±1.09%)    │ 68      │
+│ file -> map -> reduce                               │ 56 (±1.18%)    │ 66      │
 ├─────────────────────────────────────────────────────┼────────────────┼─────────┤
-│ file -> scan -> reduce                              │ 29 (±3.08%)    │ 69      │
+│ file -> scan -> reduce                              │ 30 (±1.17%)    │ 70      │
 ├─────────────────────────────────────────────────────┼────────────────┼─────────┤
-│ file -> takeN(0, n/10)                              │ 461 (±1.75%)   │ 77      │
+│ file -> takeN(0, n/10)                              │ 465 (±1.05%)   │ 77      │
 ├─────────────────────────────────────────────────────┼────────────────┼─────────┤
-│ array(2) -> array(i) -> switchLatest                │ 5,158 (±4.41%) │ 67      │
+│ file -> mergeMap                                    │ 479 (±2.44%)   │ 76      │
 ├─────────────────────────────────────────────────────┼────────────────┼─────────┤
-│ tryCatch                                            │ 2,527 (±1.12%) │ 88      │
+│ array(2) -> array(i) -> switchLatest                │ 4,946 (±4.48%) │ 70      │
+├─────────────────────────────────────────────────────┼────────────────┼─────────┤
+│ tryCatch                                            │ 2,445 (±1.13%) │ 84      │
 └─────────────────────────────────────────────────────┴────────────────┴─────────┘
 ```
diff --git a/benchmarks/bm.mergeMap.ts b/benchmarks/bm.mergeMap.ts
new file mode 100644
index 0000000..6aba6d2
--- /dev/null
+++ b/benchmarks/bm.mergeMap.ts
@@ -0,0 +1,18 @@
+/**
+ * Created by tushar on 31/08/17.
+ */
+
+import {Suite} from 'benchmark'
+import {mergeMap} from '../src/operators/MergeMap'
+import {fromArray} from '../src/sources/FromArray'
+import {array, IDeferred, run} from './lib'
+
+const a = array(1e3).map(i => array(1e3))
+
+export function bm_mergeMap(suite: Suite) {
+  return suite.add(
+    'file -> mergeMap',
+    (d: IDeferred) => run(mergeMap(1e2, fromArray, fromArray(a)), d),
+    {defer: true}
+  )
+}
diff --git a/benchmarks/run.ts b/benchmarks/run.ts
index a7647b4..91a7435 100644
--- a/benchmarks/run.ts
+++ b/benchmarks/run.ts
@@ -8,6 +8,7 @@ import {bm_debounce} from './bm.debounce'
 import {bm_fromArray_map_reduce} from './bm.fromArray-map-reduce'
 import {bm_fromArray_scan_reduce} from './bm.fromArray-scan-reduce'
 import {bm_fromArray_takeN} from './bm.fromArray-takeN'
+import {bm_mergeMap} from './bm.mergeMap'
 import {bm_switch} from './bm.switch'
 import {bm_tryCatch} from './bm.tryCatch'
 import {onCycle, onEnd} from './lib'
@@ -26,4 +27,5 @@ bm_fromArray_scan_reduce(suite)
 bm_fromArray_takeN(suite)
 bm_switch(suite)
 bm_tryCatch(suite)
+bm_mergeMap(suite)
 suite.on('cycle', onCycle).on('complete', onEnd).run()