Brazil's second day of training at their Randburg High School base didn't go to plan as sparks flew between Kaka and Felipe Melo following a rash challenge from the Juventus midfielder.Estado de Sao Paulo reports the Juventus man went in hard on Kaka during a training match which left the Real Madrid man furious, so much so he stormed off the pitch, despite swift apologies from his team-mate.Tension was high as fevered temperatures increased and it took the action of Brazil's staff and entourage to defuse the situation and restore tranquillity.Kaka was not impressed, and clearly shaken up by the incident having returned to training following a recent injury.He will not be playing in forthcoming friendlies against Zimbabwe and Tanzania on June 2 and 7 respectively. Source: Goal.com