Photos: Manny Pacquiao vs. Jessie Vargas

Manny Pacquiao throws a left to the body of Jessie Vargas during their welterweight championship fight Saturday in Las Vegas.

Manny Pacquiao covers up as Jessie Vargas goes on the offensive during their WBO welterweight title bout Saturday.

Jessie Vargas tries to duck away from a left punch by Manny Pacquiao during their WBO welterweight championship fight at the Thomas & Mack Center on Saturday night.

Manny Pacquiao lands an overhand left that knocked down Jessie Vargas in the second round of their WBO welterweight championship fight.

Manny Pacquiao knocks down Jessie Vargas during their WBO welterweight title bout in Las Vegas on Saturday night.

Manny Pacquiao lands a right to the face of Jessie Vargas during their WBO welterweight championship fight Saturday.  (Christian Petersen / Getty Images)

Jessie Vargas throws a left hook to the body of Manny Pacquiao during their welterweight championship fight in Las Vegas.

Jessie Vargas tries to cover up as Manny Pacquiao lands a right during their WBO welterweight championship fight Saturday.

Manny Pacquiao gathers himself in his corner after the conclusion of his fight against Jessie Vargas.

Manny Pacquiao celebrates after defeating Jessie Vargas in the WBO welterweight title bout on Saturday night in Las Vegas.