SAN FRANCISCO >> Clayton Kershaw is on the verge of history.No pitcher has struck out 300 batters in a single season since Randy Johnson and Curt Schilling in 2002. Kershaw is sitting on 294 after his masterful 13-strikeout performance Tuesday night in San Francisco. How much do those last six Ks mean to Kershaw?"Not enough for me to try to get it," he said Wednesday.