RIO DE JANEIRO -- Shortly after Claressa Shields punched her way through yet another elite opponent to reach another Olympic gold-medal bout, she spontaneously broke into song.Swaying gently to the tune in her head, the worlds best middleweight ripped through several bars of the Bill Withers classic Just the Two of Us, only with altered lyrics to reflect her shared mission with Shakur Stevenson as the only Americans left in the Rio Olympic boxing tournament.Just the two of us, building gold medals in the sky! Shields sang. Just the two of us, me and Shakur.U.S. coach Kay Koroma could only watch and smile.The thing about Claressa, when shes smiling and joking around, thats when shes the most dangerous, he said.Rio has been a song for Shields, who takes on the Netherlands Nouchka Fontijn on Sunday for her second Olympic gold medal.The rest of the worlds top boxers havent been able to wreck Shields good moods ever since she burst onto the international scene at the London Games. Her final bout in Rio de Janeiro is the culmination of a four-year stretch in which she hasnt lost a fight and has rarely even been tested -- certainly not yet at the Rio Olympics, where top female fighters only must win three bouts to claim gold.A lot of girls are here just to beat me, but Im here to win a gold medal, Shields said. Beating me is winning a gold medal to them, so they go out there and they fight me a lot harder than they did any other opponent.Shields is increasingly competing largely against her own preparation and motivation -- something she does well.She gave herself a C-minus grade for her opening bout, but she figured out why she didnt feel right against that Russian opponent. Because she can no longer stomach the food in the athletes village cafeteria after a month in Rio, she had consumed only a peanut-butter-and-jelly sandwich and some chocolate milk on the day before her first fight.She stopped eating like the college student that she recently was, eating proper meals and subsequently dominating Kazakhstans Dariga Shakimova to reach the final.Koroma and head womens coach Billy Walsh work on game plans with Shields, but her superior skills and athleticism often make it relatively easy work. With her confidence fairly bursting, Shields doesnt appear to require much help to dominate.You dont have to worry about if Im going to get out there and not let my hands go, Shields said. Thats never going to happen. I dont even have to warm up for that.Shields beat Fontijn at the world championships in May. Fontijn has a better chance than just about anybody in the world to end Shields dominance, but the talent gap between Shields and the middleweight field has been larger than in any division in Rio.Shields one-sided success and ensuing fame have been an enormous boon for USA Boxing, which is coming home from Brazil with one silver and one bronze from its men after failing to win anything in London.The rising popularity of womens boxing in general has allowed USA Boxing to get the funds to hire veteran Irish amateur coach Walsh, who oversees the entire team from his official position as the womens head coach.Walsh only got the job late last year, and his true focus is on the 2020 Olympics as he attempts to build a cohesive program. After some initial conflicts with his star, he has become a fervent backer of Shields, lauding her example to his other seven fighters.None of these guys understood what I was trying to build with Team USA when I got here, Walsh said. 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Galatasaray said in a statement on its website Monday that Mancini signed a three-year contract and will be paid 3.5 million euros for the upcoming season, with his salary upped to 4. BOULDER, Colo. -- Senior Xavier Johnson turned the page on an injury that sidelined him all of last season and helped Colorado get this season off to a good start in the process.Johnson had six points and seven rebounds in Colorados 90-53 win over Sacramento State on Friday night, a solid showing in his first game since tearing his left Achilles tendon in a preseason practice last year.Xavier has had a long road, a long recovery, Colorado coach Tad Boyle said. It was a tough injury, so it was good to have him back. I thought he rebounded the ball well for us defensively. Offensively, I think hes got to get a few more and thats something we continue to encourage and challenge him to do. And I think Xavier is playing really unselfishly.The crowd at the Coors Events Center welcomed Johnson back with a pregame standing ovation.It was good. It was awesome, Johnson said. I am blessed to be back on the court. I cant take anything for granted, so this feels awesome.Dominique Collier added 12 points, all on 3-pointers, and Josh Fortune scored 11 for Colorado, which has won its last nine openers at home.Nick Hornsby had 16 points and 11 rebounds for Sacramento State, which has dropped its only two meetings with Colorado. The Hornets lost their first meeting against Colorado 80-56 in 1994.Sacramento State shot 20.6 percent from the field in the first half and trailed 42-19 at halftime. Colorado built on its lead early in the second, including a stretch of three consecutive 3-pointers -- two by Collier -- as the Buffaloes opened a 55-28 lead with 14:55 to play.We got off to a bad start, couldnt score, Sacramento State coach Brian Katz said. We played pretty good `DD and made it tough for them.dddddddddddd Its almost like when we got down, we couldnt score and we broke down defensively.Theyre easily the best team well play all year, not even close. They did a great job here.Ten of 12 Colorado players who played scored.BIG PICTURE:Sacramento State: The Hornets returned four starters from last seasons team but they struggled with their shooting accuracy throughout the night. Center Eric Stuteville epitomized the teams struggles, missing his first five shots before finally hitting a layup with under five minutes remaining. Though the Hornets had won four of their previous five season openers, their long-term history is pretty rough. They dropped to 8-18 in openers since becoming a Division I program in 1991-92.Colorado: The Buffaloes possess an experienced corps of nine letter winners from last seasons 22-win team that advanced to the NCAA Tournament. The opener also provided an encouraging glimpse of newcomers Derrick White and Deleon Brown, who both could play prominent roles. White, who was in the starting lineup in his Colorado debut, sat out last season after transferring from University of Colorado at Colorado Springs, where he was a standout for three seasons. Brown, a 6-foot-4 guard, helped Brewster Academy reach the quarterfinals of the National Prep School Championships last season.UP NEXTSacramento State: Continues its season-opening road trip with a visit to Nebraska on Sunday night.Colorado: Plays Seattle on Monday as part of the Legends Classic at Barclays Center in New York. ' ' '