LAS VEGAS — Floyd Mayweather Jr. surrendered in a courtroom Friday to begin a three-month jail sentence for attacking his ex-girlfriend in September 2010 while two of their children watched.

Las Vegas Justice of the Peace Melissa Saragosa credited the undefeated five-division champion with attending weekly domestic violence counseling sessions – including one the day of the May 5 fight she allowed him to make – and with beginning to meet community service requirements she imposed in December. The judge then watched as Mayweather was handcuffed and taken away.

Mayweather didn't say a word.

"He'll be all right," Mayweather's friend, rapper 50 Cent, told reporters after arriving with Mayweather and speaking afterward with ring adviser Leonard Ellerbe outside the courthouse in downtown Las Vegas.

"It's an uncomfortable situation for everyone," he said.

Ellerbe declined to comment.

Mayweather pleaded guilty in December to reduced domestic battery charges in a hair-pulling, arm-twisting attack on Josie Harris, the mother of three of his children. The plea deal allowed him to avoid trial on felony charges that could have gotten Mayweather up to 34 years in prison if he was convicted.

"Everyone has a different version of the same story," said 50 Cent, whose real name is Curtis James Jackson III. He compared the dispute between Mayweather and Harris to the breakup of a marriage with children involved. Harris and their three children now live in Southern California.

"It's no different than anyone going through a divorce," the rap star said, "and how your friends can become your vested enemies."

Las Vegas police say that as a high-profile inmate, Mayweather probably will serve most of his time away from other prisoners in a small solo cell in the high-rise Clark County Detention Center.

Police released a statement Thursday saying visitation at the jail will be suspended Saturday for "inmate reclassification and housing changes." Officer Bill Cassell, a department spokesman, said the expected 6 a.m. to 6 p.m. lockout was not related to Mayweather's arrival.

Mayweather, who goes by the nickname "Money," apparently enjoyed some pampering Thursday while preparing for his jail stint. He posted an image Thursday on Facebook and Instagram showing him getting a pedicure. The caption read, "At home enjoying my day."

In jail, he'll have a cell about one-third the size of a small boxing ring. For at least the first week, Mayweather will be segregated for his protection from the other 3,200 inmates in the downtown Las Vegas facility, Cassell said.

Mayweather won't have a TV in his cell, and Cassell said televisions in jail dining areas probably won't carry the June 9 pay-per-view WBO welterweight fight between Mayweather rival Manny Pacquiao and Timothy Bradley at the MGM Grand Garden arena.

The judge sentenced Mayweather on Dec. 22, then later allowed him to remain free long enough to make the Cinco de Mayo weekend fight and a guaranteed $32 million. Opponent Miguel Cotto was paid $8 million.

Saragosa said when she sentenced Mayweather that she was particularly troubled that he threatened and hit Harris while their two sons watched. The boys were 10 and 8 at the time. The older boy ran out a back door to get a security guard in the gated community.

Mayweather pleaded guilty to misdemeanor domestic battery and no contest to two harassment charges.

Prosecutors dropped felony robbery, coercion, and grand larceny charges stemming from allegations that he threatened the boys and took cellphones from Harris and his son.

The misdemeanor conviction was one of several since 2002 for Mayweather in battery and violence cases in Las Vegas and in his hometown of Grand Rapids, Mich.

As part of his plea deal in the domestic battery case, he pleaded no contest and paid a $1,000 fine for a November 2010 scuffle with a homeowner association security guard in an argument about parking tickets.

He was acquitted last October of misdemeanor allegations that he threatened two homeowner association security guards during a separate parking ticket argument.

He was acquitted by a Nevada jury in July 2005 after being accused of hitting and kicking Harris during an argument outside a Las Vegas nightclub, and he received a suspended one-year jail sentence and was ordered to undergo impulse-control counseling after his conviction in 2002 of misdemeanor battery in another nightclub fight with two women.

He was fined in Grand Rapids in February 2005 and ordered to perform community service after pleading no contest to misdemeanor assault and battery for a bar fight.

Mayweather also faces a civil lawsuit in Las Vegas from two men who allege he orchestrated a shooting attack on them outside a skating rink in 2009. Police have never accused Mayweather of firing shots and he has never been criminally charged in the case.

Mayweather's jail stay will be capped at 87 days, because the judge gave him credit for three days previously served. It could be reduced by several weeks for good behavior, Cassell said.

Mayweather also was ordered to complete the yearlong domestic violence counseling program, 100 hours of community service and pay a $2,500 fine.

His lawyer, Karen Winckler, said Mayweather has paid the fine.

Mayweather's standard administrative segregation cell will have a bunk, stainless steel toilet and sink, a steel and wood desk with a permanently bolted stool and two small vertical windows with opaque safety glass.

The 7-by-12-foot cell will be a far cry from Mayweather's nearly 12,800-square-foot, two-story mansion on a cul de sac in an exclusive guarded community several miles south of the Las Vegas Strip. Mayweather's home has two garages, five bedrooms, eight bathrooms, and a swimming pool and hot tub overlooking a golf course.

Mayweather could have about an hour a day out of his cell with access to an exercise yard, Cassell said. Depending on his behavior, the boxer could later get several hours a day for exercise with other inmates also being held in protective custody.

He'll wear a standard-issue blue jail jumpsuit with the letters CCDC and orange slippers. Mayweather will be able to deposit money into a jail account to purchase snacks, soap and personal hygiene items from the jail commissary.

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  • Floyd Maweather Jr.

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    Floyd Mayweather Jr., left, appears before Clark County Court justice of the peace Melissa Saragosa to turn himself in to begin a 90-day jail term, Friday, June 1, 2012, in Las Vegas. The undefeated five-division champion surrendered Friday before the judge who sentenced him in December for attacking his ex-girlfriend in September 2010-- and then allowed him to remain free long enough to headline a May 5 fight. (AP Photo/Julie Jacobson)

  • Floyd Maweather Jr., Karen Winckler, Melissa Saragosa

    Floyd Mayweather Jr., left, appears with his attorney, Karen Winckler, before Clark County Court justice of the peace Melissa Saragosa, to turn himself in to begin a 90-day jail term, Friday, June 1, 2012, in Las Vegas. The undefeated five-division champion surrendered Friday before the judge who sentenced him in December for attacking his ex-girlfriend in September 2010, and then allowed him to remain free long enough to headline a May 5 fight. (AP Photo/Julie Jacobson)

  • Floyd Maweather Jr., Karen Winckler, 50 Cent

    Floyd Mayweather Jr., right, walks into court escorted by his attorney Karen Winckler, center, and 50 Cent, left, to begin his 90-day jail term, Friday, June 1, 2012, in Las Vegas. The undefeated five-division champion surrendered Friday before the judge who sentenced him in December for attacking his ex-girlfriend in September 2010 while two of their children watched. (AP Photo/Julie Jacobson)

  • Floyd Mayweather, Justin Bieber, Lil' Wayne, 50 Cent, Yuriyorkis Gamboa

    Floyd Mayweather Jr., center, poses for a photo with, from left, Justin Bieber, Lil' Wayne, 50 Cent and Cuban boxer Yuriyorkis Gamboa after defeating Miguel Cotto for the WBA super welterweight title, Saturday, May 5, 2012, in Las Vegas. (AP Photo/Eric Jamison)

  • Floyd Mayweather, Miguel Cotto

    Floyd Mayweather Jr., left, lands a punch against Miguel Cotto during a WBA super welterweight title fight, Saturday, May 5, 2012, in Las Vegas. Mayweather won by unanimous decision. (AP Photo/Isaac Brekken)

  • Floyd Mayweather, Miguel Cotto

    Floyd Mayweather Jr. walks back to his corner after the eighth round against Miguel Cotto during a WBA super welterweight title fight, Saturday, May 5, 2012, in Las Vegas. (AP Photo/Eric Jamison)

  • Floyd Mayweather, Miguel Cotto

    Miguel Cotto, left, pushes Floyd Mayweather Jr. up against the ropes as referee Tony Weeks steps in in the second round during a WBA super welterweight title fight, Saturday, May 5, 2012, in Las Vegas. (AP Photo/Eric Jamison)

  • Mayweather vs. Cotto - May 5, 2012

    Boxers Floyd Mayweather, left, and Miguel Cotto face-off during a news conference in New York, Tuesday, Feb. 28, 2012. Cotto and Mayweather will fight in Las Vegas on May 5, 2012 for Cotto's WBA World super welterweight title. (AP Photo/Seth Wenig).

  • Mayweather vs. Ortiz - September 17, 2011 (Larry Merchant Incident)

    Floyd Mayweather delivered a controversial knockout punch to Victor Ortiz during the fourth round of the WBC welterweight title fight in Las Vegas. Although Mayweather's victory was generally accepted as legal, it was also labelled as unsportsmanlike, as Larry Merchant reminds him after the match. Mayweather responded with a barrage of disrespectful comments before exiting the ring.

  • Mayweather and Pacquiao - March 13 , 2010 (Canceled)

    Floyd Mayweather Jr., left, prepares to spar at a gym in east London on May 22, 2009, and Manny Pacquiao, right, of the Philippines, weighs in for the junior welterweight boxing match against British boxer Ricky Hatton, May 1, 2009, in Las Vegas. The March 13, 2010 megafight between Manny Pacquiao and Floyd Mayweather Jr. was thrown into jeopardy. Mayweather's camp demanded the fighters submit to Olympic-type drug testing in the weeks leading up to the bout. Leonard Ellerbe, Mayweather's manager, said the fight would not go on if Pacquiao didn't agree to blood testing under standards followed by the United States Anti-Doping Agency. (AP Photos/Alastair Grant and Rick Bowmer, File)

  • Mayweather vs. Márquez - Sept. 19, 2009 (Comeback)

    Floyd Mayweather Jr., right, and Juan Manuel Marquez, of Mexico, during their non-title welterweight fight in Las Vegas. On May 2, 2009, it was confirmed that Mayweather was coming out of a 21-month retirement to fight <em>The Ring</em> Lightweight Champion Juan Manuel Márquez. The fight marked only the fifth time in boxing history that a non-heavyweight fight sold more than 1 million pay-per-views, with the official HBO numbers coming in at over 1 million buys; and equalling a total of approximately $52 million. (AP Photo/Rick Bowmer)

  • Mayweather vs. Hatton - December 8, 2007 (Retirement)

    Mayweather celebrates after defeating Hatton in the WBC welterweight boxing title fight at the MGM Grand hotel-casino in Las Vegas. Mayweather congratulated Hatton afterward, calling him the most difficult fighter he'd faced. Shortly after, Mayweather announced his retirement and expressed his interest in becoming a promoter. (AP Photo/Isaac Brekken)

  • Mayweather vs. De La Hoya - May 5, 2007

    Floyd Mayweather Jr., right, throws a right at Oscar De La Hoya, during the fifth round of their WBC super welterweight world championship boxing match at the MGM Grand Garden Arena in Las Vegas. The Mayweather-De La Hoya bout set the record for most PPV buys for a boxing match with 2.7 million households, shattering the record of 1.95 million for Evander Holyfield-Mike Tyson II. (AP Photo/Eric Jamison)

  • Mayweather vs. Gatti - June 25, 2005

    Floyd Mayweather Jr., right, of Las Vegas, Nev., hits Arturo Gatti of Jersey City, N. J. in second round action of their WBO world super lightweight championship bout at Atlantic City's Boardwalk Hall. Gatti's corner stopped the fight after round six, giving Mayweather his third world title. (AP Photo/Mel Evans)

  • Mayweather vs. Castillo II - December 7, 2002 (Rematch)

    Floyd Mayweather lands a left to Jose Luis Castillo of Mexico during their WBC lightweight fight at Mandalay Bay Resort in Las Vegas. Due to the closeness of their first bout, Mayweather accepted a rematch, citing the rotator cuff injury to his left shoulder -- which he sustained during training two days before the original match -- as a hindrance the first time. (AP Photo/Laura Rauch)

  • Mayweather vs. Corrales - January 20, 2001

    Floyd Mayweather, left, of Grand Rapids, Mich., stands in the ring with his father, Floyd Mayweather Sr., after defeating Diego Corrales of Sacramento, Calif., in their WBC super featherweight championship fight in Las Vegas. Prior to the bout, both Mayweather and Corrales were undefeated. (AP Photo/Eric Risberg)

  • Mayweather vs. Gerena - September 11, 1999

    Carlos Gerena, left, of Puerto Rico mixes it up with Floyd Mayweather Jr. of Grand Rapids, Mich., during the WBC super featherweight title fight in Las Vegas. Mayweather retained his title when referee Richard Steele, on advice of a ringside physician, stopped the fight after the seventh round. (AP Photo/Lori Cain)

  • Mayweather vs. Apodaca - October 11, 1996 (Professional Debut)

    Olympic medalist Floyd Mayweather of Grand Rapids, Mich., right, lands a right to the face of Roberto Apodaca of El Centro, Calif., during their super featherweight fight at Texas Station in Las Vegas. Mayweather scored a knockout at 37 seconds of the second round. (AP Photo/Lennox McLendon)