Which #1 contender has the best chance of beating The Ring champion?

[Eric Holder]

Middleweights

Sergio Martinez
Country: Argentina Record: 44-2-0 (24 KOs)Ranking: This Week: C | Last Week: C | Weeks On List: 3 Titles: WBC

vs

Felix Sturm
Country: Germany Record: 33-2-1 (14 KOs)Ranking: This Week: #1 | Last Week: #1 | Weeks On List: 346 Titles: WBA
=========
Junior Welterweights

Manny Pacquiao
Country: Philippines (General Santos City) Record: 51-3-0 (38 KOs)Ranking: This Week: C | Last Week: C | Weeks On List: 53 Titles: WBO

vs.

Timothy Bradley
Country: USA (Palm Springs, Calif.) Record: 25-0-0 (11 KOs)Ranking: This Week: #1 | Last Week: #1 | Weeks On List: 104 Titles: WBO

=======
Lightweights

Juan Manuel Marquez
Country: Mexico Record: 50-5-0 (37 KOs)Ranking: This Week: C | Last Week: C | Weeks On List: 86 Titles: WBA, WBO

vs.

Michael Katsidis
Country: Australia Record: 26-2-0 (21 KOs)Ranking: This Week: #1 | Last Week: #1 | Weeks On List: 168

======

Flyweight rematch

Pongsaklek Wonjongkam
Country: Thailand Record: 75-3-0 (39 KOs)Ranking: This Week: C | Last Week: C | Weeks On List: 477 Titles: WBC

vs.

Koki Kameda
Country: Japan (Tokyo) Record: 22-1-0 (14 KOs)Ranking: This Week: #1 | Last Week: #1 | Weeks On List: 145

======
Jr. Flyweights


Ivan Calderon
Country: Puerto Rico Record: 33-0-0 (6 KOs)Ranking: This Week: C | Last Week: C | Weeks On List: 141 Titles: WBO

vs.

Giovani Segura
Country: USA (Bell Gardens, Calif.) Record: 24-1-1 (20 KOs)Ranking: This Week: #1 | Last Week: #1 | Weeks On List: 152 Titles: WBA