Jonathan Mayo lists the top college pitchers in this year's MLB Draft. There's supposed to be decent college pitching talent early in the draft, but not so much depth. That won't be a problem for the Pirates, at least not in the first round, because the Bucs pick eighth overall.
I haven't yet seen the Pirates connected to any college pitchers -- many experts think they'll pick Arizona State shortstop Deven Marrero, although there's also been some speculation about high school pitchers Lucas Giolito and Max Fried. But with a lot of uncertainty in the first round, a college pitcher is certainly a possibility. The Bucs probably won't get Stanford pitcher Mark Appel, who many mock drafts currently going first overall to the Houston Astros. But someone like LSU's Kevin Gauman or San Francisco's Kyle Zimmer might be a slight possibility depending on how the top of the first round shakes out, and even if none of those players fall to the Bucs, they're worth keeping an eye on, simply to see who does turn out to be available when the Pirates pick.
For more on the draft, check out Minor League Ball.