SPORTING CHANCE – Joaquin M. Henson – The Philippine Star January 2, 2022 | 12:00am Only four Filipino world boxing champions are left as 2021 came to a close with WBC bantamweight king Nonito Donaire Jr., WBO bantamweight titlist JohnRiel Casimero, IBF superflyweight ruler Jerwin Ancajas and IBF minimumweight beltholder Rene Mark Cuarto the holdovers. Manny Pacquiao lost his super WBA welterweight crown to Yordenis Ugas in Las Vegas last August and has since retired while Vic Saludar surrendered his regular WBA minimumweight strap to Erick Rosa on a disputed split decision in the Dominican Re…