Only people influenced by the hocus-pocus of the Atkins diet believe the trend is to avoid carbs.
You need carbs to provide the energy for any type of phyiscal exercise/work. Avoid fatty carbs like fried food. Fatty food is difficult to digest and results in the diversion of a greater amount of blood to the digestive system thus making you possibly sleepy and certainly less alert (Your performance will be worse).
Fed 2010: Federer aged 28 16 Slams(inc. career slam) vs Sampras aged 28 14 Slams(no FO)