Matt Kemp is not in the Padres starting lineup today. Melvin Upton will start in center field and leadoff.
This is just a day off for Kemp, who has had a disappointing season thus far with a .283 wOBA and -0.87 nERD. Melvin Upton gets a tough matchup against Carlos Martinez who strikes out righties at a blistering rate of 27.9 percent and only allows a .265 wOBA.
Source: Baseball Press