in his defense, if you're just going purely on performance, wainwright's run-prevention has basically been as good as kershaw, and he's started 5 more games. of course, wainwright has been extremely lucky this year (lowest BABIP, lowest HR/FB rate and highest LOB% of his career) whereas kershaw's luck has been neutral overall, or he's even been slightly unlucky. if you were picking one to start a must-win game it would obviously be kershaw, but in terms of pure run-prevention and value for the first half, it is a close call.