Staples Center fight night

Shane Mosley lands a counterpunch after Antonio Margarito missed with a right cross during their WBA welterweight title fight Saturday night at Staples Center.  (Lori Shepler / Los Angeles Times)

The smaller Shane Mosley worked his way inside Antonio Margarito’s reach advantage by punching to the body and then to the head during their WBA welterweight bout Saturday night.  (Lori Shepler / Los Angeles Times)

Antonio Margarito uses his head to keep Shane Mosley pinned against the ropes as he works the body during their welterweight bout Saturday night at Staples Center.  (Lori Shepler / Los Angeles Times)

Shane Mosley, the aggressor throughout the bout, lands a punch to the head of Antonio Margarito on Saturday night.  (Lori Shepler / Los Angeles Times)

Shane Mosley knocks Antonio Margarito into the ropes before sending him to the canvas in the eight round Saturday night during their WBA welterweight title fight.  (Lori Shepler / Los Angeles Times)

Shane Mosley sends Antonio Margarito to the canvas after a flurry in the eighth round during their WBA welterweight title fight Saturday night. Margarito beat the count as the round ended.  (Lori Shepler / Los Angeles Times)

Antonio Margarito checks the count of referee Raul Caiz after he was sent to the canvas by a flurry from Shane Mosley in the eighth round Saturday night at Staples Center.  (Lori Shepler / Los Angeles Times)

A cornerman for Antonio Margarito comforts him after Shane Mosley beat him into submission in the ninth round Saturday night during a WBA welterweight championship bout at Staples Center.  (Lori Shepler / Los Angeles Times)

Shane Mosley celebrates after defeating Antonio Margarito in the ninth round of their WBA welterweight championship bout on Saturday night at Staples Center.  (Lori Shepler / Los Angeles Times)

Movie stars Sylvester Stallone and Gov. Arnold Schwarzenegger take in the Shane Mosley-Antonio Margarito fight from ringside seats Saturday night at Staples Center.   (Lori Shepler / Los Angeles Times)

Robert Guerrero celebrates his first-round knockout of Edel Ruiz in a junior-lightweight bout Saturday night at Staples Center.  (Lori Shepler / Los Angeles Times)

Edel Ruiz is sent reeling by a shot from Robert Guerrero during their junior-lightweight bout Saturday night at Staples Center.  (Lori Shepler / Los Angeles Times)

Edel Ruiz went to the canvas after a body shot from Robert Guerrero during their junior-lightweight bout Saturday night at Staples Center.  (Lori Shepler / Los Angeles Times)

Matvey Korobov lands the knockout punch to the face of Jose Florentino during their middleweight bout at Staples Center on Saturday evening.  (Lori Shepler / Los Angeles Times)

Matvey Korobov lands a punch to the face of Jose Florentino during their middleweight fight Saturday night at Staples Center.  (Lori Shepler / Los Angeles Times)

Jerry Belmontes lands a blow to the side of Jesus Hernandez on his way to a victory in a junior-lightweight bout Saturday night at Staples Center.  (Lori Shepler / Los Angeles Times)