For how great Pacquiao he is at lightweight, he would lose with Duran!
Even Freddy Roach said that!
listen the interview!
THAT WAS M0RE 0F A RESPECT T0 DURAN IF ANYTHING. R0ACH KN0WS MANNY KILL HIM. DURAN IS THE M0ST 0VERRATED FIGHTER IN B0XING HIST0RY. HIS BEST WIN WAS AGAINST LE0NARD AND THEN HE G0T HIS ASS KICKED 2ND TIME.
HE'S 1-5 AGAINST THE ALL TIME GREATS.  HE L0ST T0 BENITEZ AND KIRLAND IN HIS PRIME WH0 ARE N0T EVEN THAT G00D. 
Taken from Ryan Manquinana's interview with Roach.
RM : The two boxing greats who Mannys been compared to as of late, due to his success in moving up multiple weight classes are Roberto Duran and Pernell Whitaker. How do you think Manny would match up with them at 135?
FR : Its tough to compare eras, of course. Pernell was a great boxer, and Manny has trouble with the counter-punching style a little bit, but I dont think Pernell could stand the pressure. With Duran, I think Manny could beat him. Duran was a ballsy guy; he liked to fight, but, you know, No Más made me wonder if he had any quit in him. In the past, at [lightweight], I picked Duran to win, but this time I think Manny would win by decision now. 
THAT WAS ALS0 BEF0RE MANNY BEAT HATT0N AND DE LA H0YA. N0W HE'D PR0BABLY SAY MANNY BY K0. DURAN WAS T00 SL0W F0R MANNY AND IT W0ULD BE EASY TARGET PRACTICE.
103 Wins (70 knockouts, 32 decisions, 1 retirement), 16 Losses (4 knockouts, 12 decisions) [4]
Res.   Opponent   Type   Rd., Time   Date   Location   Notes
Loss    Héctor Camacho   Decision (unan.)   12 (12)   2001-07-14   Denver, Colorado   Lost NBA Super-Middleweight title.
Win    Patrick Goossen   Decision (unan.)   10 (10)   2000-08-12   Toppenish, Washington   
Win    Pat Lawlor   Decision (unan.)   12 (12)   2000-06-16   Panama City, Panama   Won NBA Super-Middleweight title.
Loss    Omar Gonzalez   Decision (unan.)   10 (10)   1999-03-06   Buenos Aires, Argentina   
Loss    William Joppy   TKO   3 (12), 2:54   1998-08-28   Las Vegas, Nevada   Fight was for WBA Middleweight title.
Win    Felix Jose Hernandez   Decision (unan.)   10 (10)   1998-01-31   Panama City, Panama   
Win    David Radford   Decision (unan.)   8 (

   1997-11-15   Temba, South Africa   
Win    Jorge Fernando Castro   Decision (unan.)   10 (10)   1997-06-14   Panama City, Panama   
Loss    Jorge Fernando Castro   Decision (unan.)   10 (10)   1997-02-15   Buenos Aires, Argentina   
Win    Mike Culbert   TKO   6 (10)   1996-09-27   Chester, West Virginia   
Win    Ariel Cruz   KO   1 (10)   1996-08-31   Panama City, Panama   
Loss    Héctor Camacho   Decision (unan.)   12 (12)   1996-06-22   Atlantic City, New Jersey   Fight was for IBC Middleweight title.
Win    Ray Domenge   Decision (unan.)   10 (10)   1996-02-20   Miami, Florida   
Win    Wilbur Garst   TKO   4 (10)   1995-12-21   Fort Lauderdale, Florida   
Win    Roni Martinez   TKO   7 (10), 2:59   1995-06-10   Kansas City, Missouri   
Loss    Vinny Pazienza   Decision (unan.)   12 (12)   1995-01-14   Atlantic City, New Jersey   Fight was for IBC Super-Middleweight title.
Win    Heath Todd   TKO   7 (10)   1994-10-18   Bay Saint Louis, Mississippi   
Loss    Vinny Pazienza   Decision (unan.)   12 (12)   1994-06-25   Las Vegas, Nevada   Fight was for IBC Super-Middleweight title.
Win    Terry Thomas   TKO   4 (10)   1994-03-29   Bay Saint Louis, Mississippi   
Win    Carlos Montero   Decision (unan.)   10 (10)   1994-02-22   Marseille, France   
Win    Tony Menefee   TKO   8 (10)   1993-12-14   Bay Saint Louis, Mississippi   
Win    Sean Fitzgerald   KO   6 (10)   1993-08-17   Bay Saint Louis, Mississippi   
Win    Jacques LeBlanc   Decision (unan.)   10 (10)   1993-06-29   Bay Saint Louis, Mississippi   
Win    Ken Hulsey   KO   2 (10), 2:45   1992-12-17   Cleveland, Ohio   
Win    Tony Biglen   Decision (unan.)   10 (10)   1992-09-30   Buffalo, New York   
Loss    Pat Lawlor   TKO   6 (10), 1:50   1991-03-18   Las Vegas, Nevada   
Loss    Sugar Ray Leonard   Decision (unan.)   12 (12)   1989-12-07   Las Vegas, Nevada   Fight was for WBC Super-Middleweight title.
Win    Iran Barkley   Decision (split)   12 (12)   1989-02-24   Atlantic City, New Jersey   Won WBC Middleweight title.
Win    Jeff Lanas   Decision (split)   10 (10)   1988-10-01   Chicago, Illinois   
Win    Paul Thorn   Retirement   6 (10)   1988-04-14   Atlantic City, New Jersey   
Win    Ricky Stackhouse   Decision (unan.)   10 (10)   1988-02-05   Atlantic City, New Jersey   
Win    Juan Ferreyra   Decision (unan.)   10 (10)   1987-09-12   Miami, Florida   
Win    Victor Claudio   Decision (unan.)   10 (10)   1987-05-16   Miami, Florida   
Loss    Robbie Sims   Decision (split)   10 (10)   1986-06-23   Caesars Palace, Las Vegas   
Win    Jorge Suero   KO   2 (10), 1:45   1986-04-18   Panama City, Panama   
Win    Manuel Zambrano   KO   2 (10), 2:57   1986-01-31   Panama City, Panama   
Loss    Thomas Hearns   KO   2 (15)   1984-06-15   Caesars Palace, Las Vegas   Fight was for WBC Light-Middleweight title.
Loss    Marvin Hagler   Decision (unan.)   15 (15)   1983-11-10   Caesars Palace, Las Vegas   Fight was for WBA, WBC and IBF Middleweight titles.
Win    Davey Moore   TKO   8 (15), 2:02   1983-06-16   Madison Square Garden, New York City   Won WBC Light Middleweight title
Win    Pipino Cuevas   TKO   4 (12), 2:26   1983-01-29   Los Angeles, California   
Win    Jimmy Batten   Decision (unan.)   10 (10)   1982-11-12   Miami, Florida   
Loss    Kirkland Laing   Decision (split)   10 (10)   1982-09-04   Detroit, Michigan   
Loss    Wilfred Benítez   Decision (unan.)   15 (15)   1982-01-30   Caesars Palace, Las Vegas   Fight was for WBC Light Middleweight title.
Win    Luigi Minchillo   Decision (unan.)   10 (10)   1981-09-26   Caesars Palace, Las Vegas   
Win    Nino Gonzalez   Decision (unan.)   10 (10)   1981-08-09   Cleveland, Ohio   
Loss    Sugar Ray Leonard   TKO   8 (15), 2:44   1980-11-25   New Orleans, Louisiana   The "No Más Fight"; lost WBC Welterweight title.
Win    Sugar Ray Leonard   Decision