The sport has the official site chicagomarathon.com . The venue for Men's middleweight boxingat the Games of the XXX Olympiad was Pontal, Rio de Janeiro,54.5 km (33.9 mi),ExCeL Exhibition Centre . 12 (from 4 confederations) teams competed in Men's middleweight boxingat the Games of the XXX Olympiad . The no. of events in sport was 14 . 37 from 31 nations competed in Men's middleweight boxingat the Games of the XXX Olympiad . It was held in 28 July – 9 August 2012,12 August
In the sport Men's middleweight boxingat the Games of the XXX Olympiad ,31 nations participated