" Fast Five " has left the competition in the dust with an $83.6 million debut to grab the No. 1 spot at the weekend box office, according to studio estimates Sunday. Universal Pictures' fifth movie in " The Fast and the Furious " franchise was by far this year's biggest opening. Its take was more than double the previous best of $39.2 million for " Rio ," the 20th Century Fox animated hit that slipped to No. 2 with $14.4 million. The No. 1 movie the two previous weekends, " Rio " raised its total to $103.6 million. "Fast Five" set a record for best April debut ever, speeding past the $71 million haul of its predecessor, "Fast & Furious," two years ago. The movie reteams stars Vin Diesel and Paul Walker as outlaw driving aces and adds Dwayne Johnson as a federal agent on their tail. The action expands beyond the franchise's traditional racing scene into a broad crime romp. "Summer began April