*BOXING/MMA: Floyd Mayweather Jr. returned to the ring in a big way Saturday with an unanimous decision over the smaller, lighter Juan Manuel Marquez in Las Vegas. In his first fight back from retirement and a 21-month absence, Mayweather knocked down the undersized Marquez in the second round and then peppered him with countless damaging shots to remain unbeaten in 40 pro fights. … Vitor Belfort knocked out Rich Franklin 3:02 into the first round to win the headline bout of UFC 103 before a rabid, sold-out crowd at the American Airlines Center in Dallas.
*GOLF: Na Yeon Choi of South Korea shot a career best 9-under 63 Saturday to take a two-stroke lead over compatriot Jiyai Shin in the Samsung World Championship at Torrey Pines in San Diego. Choi was at 15-under 201, tying the tournament’s three-round record set by Annika Sorenstam when the Swede won in 2002 and 2005. … Jay Haas and Nick Price shared the Greater Hickory Classic lead at 11-under 131 going into the final round of the Champions Tour event in Conover, N.C.
*SOCCER: Arsenal bounced back from two straight defeats in the Premier League, routing Wigan 4-0 behind Thomas Vermaelen’s two goals, and title rival Liverpool struggled to put away West Ham 3-2.
*BASKETBALL : Michael Henderson, a referee who was previously fired by the NBA, is among the group of replacements who have agreed to participate in training camp next week. … World champion Spain defeated Greece 82-64 to advance to the European basketball championship final against Serbia. Lakers center Pau Gasol led Spain with 18 points.
*ALSO: Regal Ransom made a triumphant return to the races with a wire-to-wire victory in the $750,000 Super Derby at Louisiana Downs. … USA Swimming voted to ban high-tech suits before the sport’s world governing body is expected to do the same.
