Chris Perez finished the first half with a 2.43 ERA, 1.17 WHIP and 21 saves in 22 opportunities. This is probably a good time to sell high, because both closer and team are overachieving. As for Perez, he has a 4.69 xFIP and a poor 22/15 K/BB rate 33 1/3 innings. If his peripherals remain the same in the second half, his ERA is going to spike.