Table:
text: List of boxing quadruple champions
List of Boxing Quadruple or Four Division Champions — Major Titles
List of Boxing Quadruple or Four Division Champions — Major Titles
Number_ Name_ Titles Date_ Opponent Result_ Defenses
4 Pernell Whitaker Lineal Welterweight (147) 1993-03-06 James McGirt UD 12/12 8
4 Pernell Whitaker WBA Super welterweight (154) 1995-03-04 Julio César Vásquez UD 12/12 0
5 Oscar De La Hoya WBO Super featherweight (130) 1994-03-05 Jimmy Bredahl TKO 10/12 1
5 Oscar De La Hoya WBO Lightweight (135) 1995-02-18 John-John Molina UD 12/12 6
5 Oscar De La Hoya WBC Super lightweight (140) 1996-06-07 Julio César Chávez TKO 4/12 1
5 Oscar De La Hoya Lineal Super lightweight (140) 1996-06-07 Julio César Chávez TKO 4/12 1
5 Oscar De La Hoya WBC Welterweight (147) 1997-04-12 Pernell Whitaker UD 12/12 7

text: List of boxing quadruple champions
List of Boxing Quadruple or Four Division Champions — Major Titles
List of Boxing Quadruple or Four Division Champions — Major Titles
Number_ Name_ Titles Date_ Opponent Result_ Defenses
5 Oscar De La Hoya Lineal Welterweight (147) 1997-04-12 Pernell Whitaker UD 12/12 7
6 Leo Gamez WBA Minimumweight (105) 1988-01-10 Bong Jun Kim UD 12/12 1
6 Leo Gamez WBA Light flyweight (108) 1993-10-21 Shiro Yahiro TKO 9/12 3
6 Leo Gamez WBA Flyweight (112) 1999-03-13 Hugo Rafael Soto KO 3/12 0
6 Leo Gamez WBA Super flyweight (115) 1999-03-13 Hideki Todaka KO 7/12 0
7 Roy Jones Jr. IBF Middleweight (160) 1993-05-22 Bernard Hopkins UD 12/12 1
7 Roy Jones Jr. IBF Super middleweight (168) 1993-10-21 James Toney UD 12/12 5
7 Roy Jones Jr. WBC Light heavyweight (175) 1997-08-07 Montell Griffin KO 1/12 11

Question: How many times has Pernell Whitaker been an opponent among the four-time boxing champions?