The twin blasts that killed three people and injured scores at the Boston marathon are a warning for Russia as it prepares to host the 2014 Winter Olympic Games, the sports minister said on Tuesday.

"For Russia, which will have to soon stage a number of major sporting events, this is a serious warning bell," RIA Novosti quoted Vitaly Mutko as saying.

Carlos Boozer turned his shoulder and knocked Dwyane Wade to the floor, while Nate Robinson shoved LeBron James in the same sequence.

It was physical, rugged and exactly what the Miami Heat needed as part of their preparations for the playoffs, which start this coming weekend. James scored 24 points and Wade finished with 22 as the Heat set a club record for home wins in an NBA season by beating the Chicago Bulls 105-93 on Sunday.

Two fans were shot to death on their way to a test event Sunday at a World Cup stadium in northeastern Brazil, just two months before the venue hosts matches in the Confederations Cup.

The fans were killed about 5 kilometers (3 miles) from the Arena Castelao in the city of Fortaleza, one of the six venues hosting matches in the Confederations Cup in June and one of the 12 getting ready for next year's World Cup.

Cristiano Ronaldo scored his 49th and 50th goals in all competitions this season as Real Madrid won 3-0 at Athletic Bilbao on Sunday, while Barcelona didn't need Lionel Messi to brush aside Real Zaragoza 3-0 and ease closer to the Spanish league title.

Ronaldo opened with a dipping free kick two minutes in and scored again in the 69th, before passing for Gonzalo Higuain to net a third in the 76th.

AC Milan and Napoli played out an entertaining 1-1 draw at San Siro in a battle for an automatic Champions League spot on Sunday.

It was a mixed night for Mathieu Flamini, who fired Milan into the lead in the 30th minute but was sent off 18 minutes from time.

American John Isner beat Argentina's Nicolas Almagro 6-3, 7-5 in the final of the U.S. Men's Clay Court Championship on Sunday.

Isner won his first tournament of the year and the sixth of his career. He had seven aces in the match — including two at more than 140 mph in the 10th game to hold serve — and a record 64 for the tournament.

Ferrari's Fernando Alonso emerged unscathed to take victory on Sunday in a drama-packed Chinese Grand Prix, with the Lotus of Kimi Raikkonen and Mercedes' Lewis Hamilton holding on for second and third.

A charging Sebastian Vettel came fourth, just 0.2 seconds behind Hamilton, after adopting a different tyre strategy from most of his rivals, while his Red Bull team-mate Mark Webber failed to finish on a dreadful weekend for him.

Real Madrid assistant boss Aitor Karanka has dismissed suggestions that his side got lucky in Friday's Champions League semifinal draw by being paired with Borussia Dortmund.

Madrid only managed one point from six against the 2011/12 German champions when they met in the group stages earlier this season and Karanka believes they can learn from their 3-2 defeat to Galatasaray in the second-leg of the quarterfinals, despite still progressing 5-3 on aggregate.

Germany striker Mario Gomez's agent has hinted of a move away from Bayern Munich after a frustrating season spent mainly warming the bench at the Champions League semifinalists.

Gomez, 27, has still managed to score seven Bundesliga goals this season, despite coming off the bench for nine of his 15 league appearances as Bayern were crowned German champions for the 23rd time last weekend.

Lewis Hamilton roared to his first pole position for Mercedes in qualifying on Saturday for the Chinese Grand Prix in Shanghai, as the warring Red Bulls had a day to forget.

The Briton Hamilton, who has been struggling with an allergy and went home early from the track on Thursday, left it late in the final session to grab pole ahead of Kimi Raikkonen of Lotus, the winner last month in Australia.