Round seven of the Monster Energy AMA Supercross Series heads back across the country—for the fifth and final time to California—to Qualcomm Stadium for the San Diego Supercross. Check out the Racer X arrow getting nasty on the San Diego SX track! Last week’s Houston SX was probably one of the most chaotic Supercross races I have ever witnessed, and with the forecast calling for rain in San Diego this weekend, this one could…