Difficulty walking forces Horner out of Volta a Catalunya

Chris Horner (RadioShack Leopard) was unable to start the second stage at the Volta Ciclista a Catalunya after a troubling knee issue sustained during Tirreno-Adriatico flared-up. The veteran American finished sixth-overall at the Italian WorldTour event despite suffering pain during his first outing for the 2013 season and will now look to have the injury assessed before returning to competition.