With sales in the US luxury segment growing this year for just about all manufacturers, it seems that the biggest surprise came from Lexus, which beat out Mercedes-Benz with a massive rise in sales over last year. Lexus grew 21.1 percent year-over-year, selling 26,921 units last month as opposed to Mercedes' 26,617. Mercedes, however, only grew 4.13 percent, despite its new models and downmarket move with the hot-selling CLA-Class.