Cliff Lee has made 28 starts this season, Roy Halladay 29. Of those, 13 are in-common starts: the A’s, Rays and Rangers twice, and the Angels, White Sox, Reds, Royals, Twins, Yankees and Mariners once. Those starts cancel out. Of the remaining starts, there seems to be a very wide gap in the caliber of competition, enough to at least mention. Of the 15 starts Cliff Lee does not have in common with Halladay, nine have come against teams in the bottom third in offense, as ranked by team EqA, and none have come against a team ranked in the top six.
Let me run the data this way, because I think it illustrates the point. The following numbers are the team EqA ranks for each not-in-common opponent, highest to lowest.
Halladay: 3, 4, 4, 4, 9, 9, 9, 11, 11, 14, 14, 14, 14, 17, 18, 18
Lee: 7, 7, 7, 12, 13, 13, 21, 22, 22, 25, 26, 27, 28, 28, 28It helps if you read those numbers right to left. It’s clear from this data that Cliff Lee has seen a significantly inferior set of opponents than Halladay has.