Manny Pacquiao is a great boxer... and a terrible singer.

That hasn't stopped the 10-time world champion from selling a bunch of records in his native Philippines, but he's so popular there that he was elected a Congressman in 2010 with no prior political experience. And they let him carry the national flag at the 2008 Olympics... when he wasn't in the Olympics.

North American audiences have mostly scoffed at Pacquiao's singing attempts. Remember Drake's parody at this year's ESPY Awards?

Fox Sports seemed to be mining for more laughs by inviting Pacquiao to sing an NFL-themed song on Monday. It's not clear whether the welterweight champ is in on the joke, but judge for yourself:

That may not even be the worst effort of Pac Man's singing "career." Because this happened (thank you, Auto-Tune):