Russia loses 2012 Olympic silver in women's 4×400 relay

4 × 100 metres relay - Wikipedia

Femke Bol's blazing burst down stretch leads Netherlands to gold

I feel at peace': Allyson Felix exits stage with record 11th medal

I feel at peace': Felix exits stage with record 11th medal

Team USA women's 4x400 cruises to Olympic gold medal

I feel at peace': Felix exits stage with record 11th medal

Ukrainian sprinters register first failed drugs tests of IAAF

Gator Nation Is At The 2012 Olympics, Day 4: Ryan Lochte, Conor

McCorory, Team USA take silver at worlds in 4×400 relay as