Acrobatic Strike

 
Prerequisite(s): Tumble 12+ ranks
 
Benefit: If you succeed in using Tumble to avoid an opponent's attack of opportunity, you gain a +4 bonus on the next attack that you make against that foe as long as the attack occurs before the end of your current turn.
 
Special: A fighter can select Acrobatic Strike as one of his fighter bonus feats.
 
Source:PHB II