Ambush - ambush, ambush. Learn to use your special items in conjunction to coordinate an attack. Drop freezes, dazes, anti-shields, and half-speeds before you teleport your opponent to you.
Plan - take a minute to specify which items you want your bases to build to help you prepare an ambush.
Sabotage - destroy your opponent's bases in order to cripple his efforts to produce technology.
Escape - always have an escape planned in case you become the one who is being ambushed. Teleports, hyperspace, cloak, and daze can be the difference between living to fight another day and space dust.