THOMAS MUELLER, THE SILENT KILLER: No one notices him as he surreptitiously steps in to nod home that corner. He moves like an apparition, often gliding in without any fancy step-overs or jinking runs. But Mueller now has 10 goals in World Cups. He is rarely injured and has a habit of scoring in big games. He is still only 24. One goal against Argentina could hand him a second straight Golden Boot (he is one behind James Rodriguez for goals scored, but has one more assist). Argentina will be very wary of him. (Reuters Photo)