The ball will go in the direction of it's rotation after it hits friction. Rotation must be applied by the bowler, so leftys have the same issue as a righty.
Having said that, most leftys are forced outside, or closer to friction due to less traffic on that side of the lane which may lead some to believe that they are "naturals" at creating hook.
Both leftys and rightys must apply the rotation to the ball, though.
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Lane Carter, Strike Zone Pro Shops - Salt Lake City, Utah
Brunswick Amateur Staff
www.brunswickbowling.com