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Seems like Sohei Monk is the martial with the best chance at high levels. Pick up weapon training (bows), rapid shot, manyshot, far shot, deadly aim, clustered shots, and a bow with distance and seeking. Also include boots of speed. Round one you have a chance of winning initiative, and can unleash 11 attacks before the caster can act. Add brilliant energy to the enhancements and you might get through Emergency Force Shield (though I doubt that is on the prd, and thus is legal). Of course, while it has the best chance of working at level 20, it still will probably be faced with the problem of the caster having survived (akashic form, greater possession, clone in a bag of holding, bad luck, facing a caster with a lot of HP, etc).
Emergency force sphere is not in the PRD.
Fickle winds is, and will nullify the whole sohei build past the first attack using PRD only (which is a common strategy for a 20th level PRD-only wizard).