Definitely have issues at closer. Baez will drive you crazy and Mesa won't be much better, but if you can handle the occasional "flare ups", you should still expect 60-70 saves between them.
One thought to consider. You seem to have a fair amount of power. If Adam Dunn is available (which I doubt), you might consider him for utility instead of J. Bay. Bay is just beginning to hit off a tee again AND he strikes out a lot. Dunn strikes out a lot, but he also gets a lot of walks. Since you count OPS, this makes up for a lot of Dunn's shortfall in BA. Good luck.