in their late 20s or early 30s? barry zito, mike hampton, johan santana, jake peavy, jason schmidt, john lackey, roy oswalt (didn't completely fall off a cliff, but certainly regressed) Johan fell off a cliff? well he certainly hasn't been as good as he was with the twins (K/9 IP: 9.5 with twins, 7.6 with mets) and he's missed a lot of time due to injury, which is a risk you take when you sign a high-priced free agent to a big contract.