Olympics: The best photos on day 13

Workers sweep the athletics track at the Bird's Nest stadium in the pouring rain Photograph: Oliver Morin/AFP

Qian Zhenhua of China lets out a scream after the fencing discipline of the men's modern pentathlon Photograph: Desmond Boylan/Reuters

Grim skies overhead as participants in the women's 20km walk make their way past the stadium Photograph: Axel Schmidt/AFP

Canadian diver Marie-Eve Marleau performs in the women's 10m platform semi-final Photograph: Martin Bureau/AFP

Athletes speed around the track in the men's 5,000m heat Photograph: Nic Bothma/EPA

Mike Hazle of the US prepares to launch the javelin during qualifying Photograph: Kai Pfaffenbach/Reuters

Tatyana Sibileva of Russia helps Ryta Turava of Belarus from the track after the women's 20km walk final Photograph: Al Bello/Getty

Frédéric Xhonneux of Belgium leaps into the sandpit during the long jump of the men's decathlon Photograph: Diego Azubel/EPA

Bryan Clay of the US walks from the track after racing in the 100m of the men's decathlon Photograph: Michael Steele/Getty

Son Taejin of South Korea lands a kick on Dennis Bekkers of the Netherlands during their men's under 68kg taekwondo match Photograph: John Yeon-Je/AFP

Romana Dubnova of the Czech Republic limbers up ahead of the women's high jump qualification Photograph: Gero Breloer/EPA

An athlete is reflected on the water during qualifying for the women's high jump final Photograph: Jewel Samad/AFP

Georgia's Revazi Mindorashvili, left, is grabbed by Germany's Davyd Bichinashvili during their 84kg freestyle wrestling match Photograph: Ed Wray/AP