Rafael Nadal's ailing left knee may continue to bother him until the end of the month, his coach said Monday.

Nadal practiced for 90 minutes with Nicolas Massu of Chile on Monday, his fourth straight day of training since arriving in the country for his first match in more than seven months.

Chelsea goalkeeper Petr Cech has been voted the Czech Republic's player of the year for 2012.

The 30-year-old Czech international won Monday's poll of players, coaches, football federation officials and journalists for the fifth consecutive year and record sixth time overall.

Lionel Messi extended his record streak by scoring in his 12th consecutive Spanish league game to give leader Barcelona a 1-1 draw at Valencia on Sunday, while Atletico Madrid remained perfect at home through 20 games in all competitions.

Midfielder Ever Banega struck first for Valencia in the 33rd, only for Messi to level for the visitors from the penalty spot six minutes later.

Mario Balotelli marked his return to Serie A by scoring both goals — including the winner in added time — in AC Milan's 2-1 win over Udinese on Sunday.

Balotelli gave Milan the lead in the 25th minute at the San Siro by redirecting a cross from Stephen El Shaarawy at the edge of the box with one touch. Then after Giampiero Pinzi had brought Udinese level in the 55th, Balotelli put Milan back in front with a penalty four minutes into injury time.

The Boston Celtics held off a late Los Angeles challenge to edge the Clippers 106-104 in the NBA on Sunday, improving to a 4-0 record since losing Rajon Rondo to a season-ending knee injury.

On a day in which the NBA carried on in the shadows of the NFL's Super Bowl, Miami notched its 10th straight win over Toronto while the Los Angeles Lakers had narrow victory over Detroit.

In a Super Bowl that went from blowout to blackout to shootout, the Baltimore Ravens held on to edge the San Francisco 49ers 34-31 on Sunday in one of the most thrilling NFL deciders ever.

A power outage at the Superdome early in the second half stopped America's biggest sporting event for more than half an hour and seemed to rob the Ravens of their momentum, having just established a 22-point lead.

Muhammad Ali's daughter scotched rumors of her father being near death Sunday, saying he was at home watching the Super Bowl.

May May Ali says she talked to her father Sunday morning on the phone and he was fine. She says he was watching the Super Bowl at home in Arizona, wearing a Baltimore Ravens jersey.

Marcel Granollers and Marc Lopez battled to a five-set doubles triumph to keep five-time champions Spain alive in their Davis Cup World Group first-round tie against Canada on Saturday.

Spain, winners of three of the past five editions of the nations tournament and runners-up to the Czech Republic last year, still face a daunting task on Sunday, when they must take both of the reverse singles to turn the tables on the hosts, who take a 2-1 lead into the last day of the best-of-five match tie.

Britain's Luol Deng scored 25 points and grabbed 14 rebounds to help power the injury-depleted Chicago Bulls to a 93-76 rout of the Atlanta Hawks in an NBA game on Saturday.

Chicago's defense kept the Hawks to only 16 points in each of the final two quarters, Atlanta hitting only 39 percent from the field, as the Bulls improved to 29-18 and remained ahead of Indiana atop the Central division.

Real Madrid's dismal season went from bad to worse when Cristiano Ronaldo scored an own-goal to hand relegation-threatened Granada a shock 1-0 win on Saturday.

Real coach Jose Mourinho had already given up winning the league before Christmas and this latest blow means that Barcelona can increase their lead over them to 18 points if they win at Valencia on Sunday.