Olympians shine in collision events like boxing, rugby, judo and handball

Yael Castiglione of Argentina challenges Brazil's Juciely Barreto for a block during their volleyball match. Marcelo Del Pozo/Reuters

Denis Iartcev of Russia tangles with Lasha Shavdatuashvili of Georgia in the 73kg judo event. Kai pfaffenbach / Reuters

Miles Chamley-Watson of the US and Russia's Artur Akhmatkhuzin engage in a staredown during the individual foil competition. Issei Kato/Reuters

Emma Tonegato of Australia scores while being tackled by Leyla Alev Kelter of the US during their rugby sevens match. Phil Noble/Reuters

Paul Omba Biongolo of France takes a punch from Azerbaijan's Abdulkadir Abdullayev in their 91kg bout. Peter Cziborra/Reuters

Nikola Karabatic of France is subdued by Tunisia defenders in the handball competition. Kai Pfaffenbach/Reuters

Alaa Ali of Iraq reacts as he collides with a member of Team Brazil during their group soccer match. Ueslei Marcelino/Reuters