Sport: 24 hours in pictures

Runners head down the back straight during The Mix Business With Twilight Racing Handicap Stakes Race at Kempton Park Racecourse Photograph: Julian Herbert/guardian.co.uk

Monterrey's Aldo De Nigris heads the ball ahead of America's Aquivaldo Mosquera. The match finished 0-0 but Monterrey triumphed 2-1 the penalty shoot-out to book their ticket in the Copa Libertadores Photograph: Mark J. Terrill/guardian.co.uk

Aravane Rezai screams in frustration after losing a point against Serena Williams in their semi-final at the Sydney International tennis tournament. The number 24 in the world had Williams on the ropes in the second set as she served for the match at 5-3 but Williams rallied to win the next five games before finally winning the match 3-6 7-5 6-4. Williams, who is the top seed, will face Elena Dementieva in Friday's final Photograph: Greg Wood/guardian.co.uk

Spectators take a picture as Switzerland's two-woman team Sabina Hafner,left, and Martina Gilardoni speed down the track during a training session for the Bobsleigh World Cup tournament in St. Moritz Photograph: Arnd Wiegmann/guardian.co.uk

Barcelona forward Leo Messi reacts after missing a chance to score against Sevilla during their Spanish King's Cup soccer match at Ramon Sanchez Pizjuan stadium in Seville. Barca won 0-1 but were eliminated from the competition on away goals after Sevilla won 2-1 at the first leg at Camp Nou Photograph: Julio Munoz/guardian.co.uk

Andy Murray takes evasive action to avoid a serve from Sam Querrey at the Kooyong Classic tennis tournament in Melbourne. Murray won the exhibition match 6-1 6-4 Photograph: William West/guardian.co.uk

Nasser Al-Attiyah powers his Volkswagen through a small stream during the 11th stage of the Dakar 2010, between Santiago, Chile and San Juan, Argentina. Guerlain Chicherit won the stage, with Orlando Terranova taking second place and Giniel De Villiers finishing third Photograph: Gabriel Bouys/guardian.co.uk

Somen Tchoyi of Cameroon,right, and Brou Apanga Moise jump for the ball during their group stage match at the African Cup of Nations, which Gabon won 1-0 Photograph: Gianluigi Guercia/guardian.co.uk

Roger Federer hits a backhand during a practice session ahead of the 2010 Australian Open in Melbourne Photograph: Mark Dadswell/guardian.co.uk

Denver Nuggets Chauncey Billups, centre, is fouled by Orlando Magic's Mickael Pietrusas as he goes up for a shot. The Nuggets won their NBA game 115-97 Photograph: David Zalubowski/guardian.co.uk

Shane Long, right, glances a header past Liverpool goalkeeper Diego Cavalieri to make give Reading a 2-1 lead during the second period of extra time at their FA Cup replay football match. The Royals held on to record their first ever victory at Anfield and knock Liverpool out of the FA Cup therefore heaping more pressure on Benitez Photograph: Paul Ellis/guardian.co.uk

Skiers compete in the women's 7.5km sprint event at the Biathlon World Cup in the southern German town of Ruhpolding. Sweden's Anna-Carin Olofsson won the event ahead of Russia's Olga Medvedtseva, 2nd, and Germany's Magdalena Neuner,3rd Photograph: Oliver Lang/guardian.co.uk