Skye Nicolson defeated Dyana Vargas by unanimous decision to retain her WBC featherweight world title on Saturday night at Wells Fargo Center in Philadelphia.
Nicolson (11-0, 1 KO), of Queensland, Australia, dominated Vargas throughout the fight, earning identical scorecards of 100-90, 100-90 and 100-90. It was Nicolson's first defense of the belt she won back in April with a unanimous decision over Sarah Mahfoud in Las Vegas.
Vargas (19-2, 12 KOs), of Sabana Iglesia, Dominican Republic, was carrying a three-fight winning streak (two by KO) before she faced Nicolson in her first world title fight.
With the win, Nicolson solidifies her No. 2 spot in the featherweight division, just behind unified champion Amanda Serrano.
Rankings will be updated every Tuesday. They'll be based on recent bouts, head-to-head competition and the quality of opponent. As with almost everything, until fighters square off against one another, there is a layer of subjectivity to it. Fighters who haven't fought in 18 months and don't have a fight scheduled will be removed from the rankings until they fight again.
For a list of the current champions in all weight classes, click here. For women's P4P rankings, click here.
175+ pounds - Super middleweight - Middleweight - Junior middleweight - Welterweight - Junior welterweight - Lightweight - Junior lightweight - Featherweight - Junior featherweight - Bantamweight - Junior bantamweight - Flyweight - Junior flyweight - Strawweight - Atomweight
175+ POUNDS
1. Lani Daniels 
Previous ranking: No. 1
Record: 10-2-2, 1 KOs
Last: W (MD10) Desley Robinson, Dec. 2
Next: Sept. 7 vs. Bolatito Oluwole
2. Vanessa Lepage-Joanisse Previous ranking: No. 2
Record: 7-1, 2 KO
Last: W (SD10) Abril Argentina Vidal, March 7
Next: July 27 vs. Claressa Shields
3. Alrie Meleisea Previous ranking: No. 3
Record: 6-2-1, 0 KOs
Last: L (UD10) Lani Daniels, May 27
Next: TBA
4. Raquel Miller Previous ranking: No. 4
Record: 13-0, 6 KOs
Last: W (TKO1) Angie Paola Rocha, March 10
Next: TBA
5. Angie Paola Rocha Previous ranking: No. 5
Record: 14-4-3, 7 KOs
Last: L (TKO1) Raquel Miller, March 10
Next: July 20 vs. Che Kenneally
SUPER MIDDLEWEIGHT (Up to 168 pounds)
1. Savannah Marshall Previous ranking: No. 1
Record: 13-1, 10 KOs
Last: W (MD10) Franchon Crews Dezurn, July 1
Next: TBA
2. Franchon Crews-Dezurn Previous ranking: No. 2
Record: 9-2, 2 KOs
Last: W (UD10) Shadasia Green, Dec. 15
Next: TBA
3. Shadasia Green Previous ranking: No. 3
Record: 13-1, 11 KOs
Last: L (UD10) Franchon Crews-Dezurn, Dec. 15
Next: July 20 vs. Natasha Spence
4. Abril Argentina Vidal Previous ranking: No. 4
Record: 10-2, 4 KOs
Last: L (SD10) Vanessa Lepage-Joanisse, March 7
Next: TBA
5. Olivia Curry Previous ranking: No. 5
Record: 7-2-1, 2 KOs
Last: Draw (SD16) Melody Popravak, April 27
Next: TBA
MIDDLEWEIGHT (Up to 160 pounds)
1. Claressa Shields Previous ranking: No. 1
Record: 14-0, 2 KOs
Last: W (UD10) Maricela Cornejo, June 3
Next: July 27 vs. Vanessa Lepage-Joanisse
2. Savannah Marshall Previous ranking: No. 2
Record: 13-1, 10 KOs
Last: W (MD10) Franchon Crews Dezurn, July 1
Next: TBA
3. Mapule Ngubane Previous ranking: No. 3
Record: 12-8-3, 2 KOs
Last: W (UD10) Rita Mrwebi, Dec. 9
Next: TBA
4. Olivia Curry Previous ranking: No. 4
Record: 7-1, 2 KOs
Last: Draw (SD16) Melody Popravak, April 27
Next: TBA
5. Melinda Watpool Previous ranking: No. 5
Record: 6-0, 2 KO
Last: W (UD8) Adriana Dos Santos Araujo, April 13
Next: TBA
JUNIOR MIDDLEWEIGHT (Up to 154 pounds)
1. Terri Harper Previous ranking: No. 1
Record: 14-2-2, 6 KOs
Last: L (MD10) Sandy Ryan, March 23
Next: Aug. 24 vs. Rhiannon Dixon
2. Ema Kozin Previous ranking: No. 2
Record: 24-1-1, 12 KOs
Last: W (SD10) Hannah Rankin, Nov. 18
Next: TBA
3. Femke Hermans Previous ranking: No. 3
Record: 18-4, 7 KOs
Last: W (UD6) Ester Konecna, Jan. 13
Next: TBA
4. Cecilia Braekhus Previous ranking: No. 4
Record: 37-2-1, 9 KOs
Last: Draw (MD10) Terri Harper, Oct. 7
Next: TBA
5. Dilara Yucel Previous ranking: No. 5
Record: 16-0, 11 KOs
Last: W (KO1) Sonja Pilipovic, June 22
Next: TBA
Editor's note: Natasha Jonas relinquished her No. 1 spot after moving to welterweight.
WELTERWEIGHT (Up to 147 pounds)
Natasha Jonas keeps her IBF title via split decision vs. Mikaela Mayer Saturday night in England.
1. Natasha Jonas Previous ranking: No. 1
Record: 15-2-1, 8 KOs
Last: W (SD10) Mikaela Mayer, Jan. 20
Next: TBA
2. Sandy Ryan Previous ranking: No. 2
Record: 7-1-1, 3 KOs
Last: W (TKO4) Terri Harper, March 23
Next: TBA
3. Lauren Price Previous ranking: No. 3
Record: 7-0, 1 KO
Last: W (TD9) Jessica McCaskill, May 11
Next: TBA
4. Jessica McCaskill Previous ranking: No. 4
Record: 12-4, 5 KOs
Last: L (UD10) Lauren Price, May 11
Next: TBA
5. Mikaela Mayer Previous ranking: No. 5
Record: 19-2, 5 KOs
Last: L (SD10) Natasha Jonas, Jan. 20
Next: TBA
JUNIOR WELTERWEIGHT (Up to 140 pounds)
1. Katie Taylor Previous ranking: No. 1
Record: 23-1, 6 KOs
Last: W (MD10) Chantelle Cameron, Nov. 25
Next: Nov. 15 vs. Amanda Serrano
2. Chantelle Cameron Previous ranking: No. 2
Record: 19-1, 8 KOs
Last: W (MD10) Elhem Mekhaled, July 20
Next: TBA
3. Jessica McCaskill Previous ranking: No. 3
Record: 12-4, 5 KOs
Last: L (UD10) Lauren Price, May 11
Next: TBA
4. Elhem Mekhaled Previous ranking: No. 4
Record: 17-3, 3 KOs
Last: L (MD10) Chantelle Cameron, July 20
Next: TBA
5. Anahi Ester Sanchez Previous ranking: No. 5
Record: 24-6, 13 KOs
Last: W (UD10) Estefania Karen Alaniz, April 19
Next: TBA
Editor's note: Kali Reis has been removed due to inactivity.
LIGHTWEIGHT (Up to 135 pounds)
1. Katie Taylor Previous ranking: No. 1
Record: 23-1, 6 KOs
Last: W (MD10) Chantelle Cameron, Nov. 25
Next: Nov. 15 vs. Amanda Serrano
2. Rhiannon Dixon Previous ranking: No. 2
Record: 10-0, 1 KO
Last: W (UD10) Karen Elizabeth Carabajal, April 13
Next: Aug. 24 vs. Terri Harper
3. Caroline Dubois Previous ranking: No. 3
Record: 9-0, 5 KO
Last: W (UD10) Miranda Reyes, Feb. 3
Next: Aug. 3 vs. Maria Moneo
4. Jessica Camara Previous ranking: No. 4
Record: 13-4, 3 KOs
Last: W (MD10) Hyun Mi Choi, April 27
Next: Sept. 14 vs. Bonnie Hunter
T-5. Beatriz Fereira Previous ranking: No. 5
Record: 5-0, 2 KO
Last: W (TUD6) Yanina del Carmen Lescano, April 27
Next: TBA
T-5. Maira Moneo Previous ranking: No. 5
Record: 14-1, 3 KO
Last: W (UD10) Lizbeth Crespo, Dec. 15
Next: Aug. 3 vs. Caroline Dubois
JUNIOR LIGHTWEIGHT (Up to 130 pounds)
1. Delfine Persoon Previous ranking: No. 1
Record: 49-3-1 NC, 19 KOs
Last: W (UD6) Agustina Marisa Belen Rojas, Nov. 6
Next: TBA
2. Elhem Mekhaled Previous ranking: No. 2
Record: 16-3, 3 KOs
Last: L (MD10) Chantelle Cameron, July 20
Next: TBA
3. Beatriz Ferreira Previous ranking: No. 3
Record: 5-0, 2 KO
Last: W (TUD6) Yanina del Carmen Lescano, April 27
Next: TBA
4. Bo Mi Re Shin Previous ranking: No. 4
Record: 16-2-3, 9 KOs
Last: W (TKO3) Pattarawan Thaosuwan, Oct. 8
Next: TBA
5. Christina Linardatou Previous ranking: No. 5
Record: 14-3, 6 KOs
Last: L (UD10) Alycia Baumgardner, July 15
Next: TBA
Editor's note: Alycia Baumgardner has been removed for testing positive for a banned substance.
FEATHERWEIGHT (Up to 126 pounds)
1. Amanda Serrano Previous ranking: No. 1
Record: 47-2-1, 31 KOs
Last: W (TKO2) Stevie Morgan, July 20
Next: TBA
2. Skye Nicolson Previous ranking: No. 2
Record: 11-0, 1 KOs
Last: W (UD10) Dyana Vargas, July 13
Next: TBA
3. Sarah Mahfoud Previous ranking: No. 3
Record: 14-2, 3 KOs
Last: L (UD10) Skye Nicolson, April 6
Next: TBA
4. Daniela Romina Bermudez Previous ranking: No. 4
Record: 32-4-3, 12 KOs
Last: W (TKO3) Lucrecia Manzur, Sept. 23
Next: TBA
5. Nina Meinke Previous ranking: No. 5
Record: 18-3, 4 KOs
Last: W (UD10) Laura Ledezma, Oct. 28
Next: TBA
Editor's note: Erika Cruz moved down to junior featherweight.
JUNIOR FEATHERWEIGHT (Up to 122 pounds)
1. Yamileth Mercado Previous ranking: No. 1
Record: 24-3, 5 KOs
Last: W (UD10) Ramla Ali, June 29
Next: TBA
2. Ellie Scotney Previous ranking: No. 2
Record: 9-0, 0 KOs
Last: W (UD10) Segolene Lefebvre, April 13
Next: TBA
3. Erika Cruz Previous ranking: No 3
Record: 17-2-1, 3 KOs
Last: Draw (SD10) Nazarena Romero, May 11
Next: TBA
4. Mea Motu Previous ranking: No. 4
Record: 19-0, 7 KOs
Last: W (TKO2) Noppaket Srisawas, April 26
Next: TBA
5. Segolene Lefebvre Previous ranking: No. 5
Record: 18-1, 1 KO
Last: L (UD10) Ellie Scotney, April 13
Next: TBA
BANTAMWEIGHT (Up to 118 pounds)
1. Dina Thorslund Previous ranking: No. 1
Record: 22-0, 9 KOs
Last: W (UD10) Seren Cetin, May 25
Next: TBA
2. Diana Laura Fernandez Previous ranking: No. 2
Record: 31-4-1, 5 KOs
Last: W (TKO3) Soledad del Valle Frias, March 8
Next: TBA
3. Cherneka Johnson Previous ranking: No. 3
Record: 16-2, 6 KOs
Last: W (MD10) Nina Hughes, May 11
Next: TBA
4. Yuliahn Luna Avila Previous ranking: No. 4
Record: 25-4-1, 4 KOs
Last: L (UD10) Dina Thorslund, Sept. 1
Next: TBA
5. Miyo Yoshida Previous ranking: No. 5
Record: 17-4, 0 KOs
Last: W (UD10) Ebanie Bridges, Dec. 9
Next: TBA
JUNIOR BANTAMWEIGHT (Up to 115 pounds)
1. Diana Laura Fernandez Previous ranking: No. 1
Record: 31-4-1, 5 KOs
Last: W (TKO3) Soledad del Valle Frias, March 8
Next: TBA
2. Asley Gonzalez Macias Previous ranking: No. 2
Record: 16-2, 7 KOs
Last: W (SD10) Lourdes Juarez, March 25
Next: TBA
3. Irma Garcia Previous ranking: No. 3
Record: 23-5-1, 4 KOs
Last: W (UD10) Stephanie Silva, Nov. 11
Next: TBA
4. Carla Ayelen Merino Previous ranking: No. 4
Record: 14-2, 2 KOs
Last: W (UD10) Micaela Milagros Lujan, April 27
Next: TBA
5. Micaela Lujan Previous ranking: No. 5
Record: 14-2-1, 5 KOs
Last: L (UD10) Carla Ayelen Merino, April 27
Next: TBA
FLYWEIGHT (Up to 112 pounds)
1. Gabriela Celeste Alaniz Previous ranking: No. 4
Record: 15-1, 6 KOs
Last: w (MD10) Marlen Esparza, April 27
Next: TBA
2. Gabriela Fundora Previous ranking: No. 2
Record: 13-0, 6 KOs
Last: W (TKO10) Christina Cruz, Jan. 27
Next: TBA
3. Kenia Enriquez Previous ranking: No. 3
Record: 28-1, 11 KOs
Last: W (UD10) Maria Salinas, Feb. 2
Next: TBA
4. Marlen Esparza Previous ranking: No. 4
Record: 14-2, 1 KO
Last: L (MD10) Gabriela Celeste Alaniz, April 27
Next: TBA
5. Arely Mucino Previous ranking: No. 5
Record: 32-4-2, 11 KOs
Last: L (KO5) Gabriela Fundora, Oct. 21
Next: TBA
JUNIOR FLYWEIGHT (Up to 108 pounds)
1. Jessica Nery Plata Previous ranking: No. 1
Record: 30-2, 3 KOs
Last: W (SD10) Sarah Bormann, Dec. 16
Next: TBA
2. Evelin Bermudez Previous ranking: No. 2
Record: 20-1-1, 7 KOs
Last: W (TKO8) Jessica Basulto Salazar, May 4
Next: TBA
3. Yesica Yolanda Bopp Previous ranking: No. 2
Record: 39-3, 17 KOs
Last: W (UD10) Roxana Maria Colmenarez, Dec. 16
Next: TBA
4. Kim Clavel Previous ranking: No. 4
Record: 19-2, 3 KOs
Last: W (UD10) Katherine Renee Lindenmuth, May 16
Next: TBA
5. Tania Enriquez Previous ranking: No. 5
Record: 21-1, 10 KOs
Last: W (TKO1) Cecilia Nino Rodriguez, July 29
Next: TBA
STRAWWEIGHT (Up to 105 pounds)
1. Seniesa Estrada Previous ranking: No. 1
Record: 26-0, 9 KOs
Last: W (UD10) Yokasta Valle, March 29
Next: TBA
2. Yokasta Valle Previous ranking: No. 2
Record: 30-3, 9 KOs
Last: L (UD10) Seniesa Estrada, March 29
Next: TBA
3. Sarah Bormann Previous ranking: No. 3
Record: 18-1, 7 KO
Last: W (UD10) Tamara Elisabet Demarco, May 4
Next: TBA
4. Tina Rupprecht Previous ranking: No. 4
Record: 13-1-1, 3 KOs
Last: W (UD10) Fabiana Bytyqi, Jan. 13
Next: TBA
5. Anabel Ortiz Previous ranking: No. 5
Record: 33-6, 4 KOs
Last: L (UD10) Yokasta Valle, Nov. 4
Next: TBA
ATOMWEIGHT (Up to 102 pounds)
1. Eri Matsuda Previous ranking: No. 1
Record: 7-1-1, 1 KO
Last: W (SD10) Yuko Kuroki, Jan. 12
Next: TBA
2. Sumire Yamanaka Previous ranking: No. 2
Record: 8-0, 3 KOs
Last: W (UD10) Mika Iwakawa, Jan. 12
Next: TBA
3. Tina Rupprecht Previous ranking: No 3
Record: 13-1-1, 3 KOs
Last: W (UD10) Fabiana Bytyqi, Jan. 13
Next: TBA
4. Montserrat Alarcon Previous ranking: No. 4
Record: 19-5-2, 0 KOs
Last: W (UD8) Cecilia Mendoza, Oct. 27
Next: TBA
5. Fabiana Bytyqi Previous ranking: No. 5
Record: 20-1-2, 5 KOs
Last: L (UD10) Tina Rupprecht, Jan. 13
Next: TBA