Sport: 24 hours in pictures

Skaters race down a purpose-built ice track during the the Red Bull Crash Ice event in Quebec, Canada Photograph: Rogerio Barbosa/AFP/Getty Images

Seven time Tour de France winner Lance Armstrong rides during the final stage of the Tour Down Under in Australia. He finished 29th out of 133 riders Photograph: Dave Hunt/EPA

Roger Federer of Switzerland plays a backhand in his fourth round match against Tomas Berdych during day seven of the Australian Open Photograph: Scott Barbour/Getty Images

The silver shoes belonging to Novak Djokovic of Serbia are seen as he serves the ball to Marcos Baghdatis of Cyprus at the Australian Open Photograph: Greg Wood/AFP/Getty Images

Jelena Dokic of Australia watches the ball as she plays a return stroke during her women's singles match against Alisa Kleybanova of Russia Photograph: Torsten Blackwood/AFP/Getty Images

Competitors take aim during the Biathlon World Cup at a ski resort northeast of Italy. Russia's Ekaterina Iourieva won the race ahead Sweden's Helena Jonsson Photograph: Alessandro Bianchi/Reuters

Sergey Chadayev of Russia during the men's 500m event at the Speed Skating World Cup in Kolomna, southeast of Moscow Photograph: Denis Sinyakov/Reuters