Abstract: An integral inner seal opening means within a sport closure cap for containers having a cylindrical mouth opening, for which a tamper evident inner seal with a reinforced rim secures the mouth opening. The closure cap holds a plurality of protrusions, preferably three, extending towards the inner seal, each having cutting edges of which the lower one is at a smaller radius. These protrusions engage with the tamper evident inner seal, when the cap is rotated clockwise, thereby cutting off part of the inner seal rim edge and at the same time cutting three banana shape slots in the inner seal. For single serve beverage bottles with tamper evident inner seal and a sport closure, there is no need to unscrew the cap for opening the inner seal and getting access to the beverage. Initially the reinforced inner seal rim is used to prevent protrusions from accidentally opening the bottle inner seal.