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I don't think there's anything that could be done to convince someone that Matt Kemp isn't worth holding on to for the rest of the season. He's an absolute beast right now—.335 average, .420 OBP, .638 SLG, 20 HR, 56 RBI, 16 SB.
There's nothing he isn't doing. He's hitting for power, hitting for average, getting on base and then stealing bags when he's there.
Still, there may be some cause for concern as the season goes on. In both 2010 and 2009, Kemp's average, ability to get on base and power all dropped significantly after the All-Star break.
In 2010, he hit .261 for the first half of the year and just .233 for the second. In 2009, he hit .320 and then just .270. It wasn't just his average either—on-base percentage and slugging went down as well.
However, Kemp is still going to be more productive than the majority of the league, even when he's playing under his potential.