San Francisco righthander Kyle Zimmer will miss his start this weekend at Pepperdine due to a right hamstring injury.

Director of baseball operations Bryan Zahn said the Dons intended to err on the side of caution with the junior, who is 4-3, 2.71 and has vaulted toward the top of teams' lists for the 2012 draft. He has an 85-13 strikeout-walk ratio in 76 1/3 innings with 63 hits allowed and just three home runs.

Zimmer, a 6-foot-4, 220-pounder, tweaked his right hamstring while fielding a bunt last week in his 10-strikeout, seven-inning outing against Brigham Young. Earlier in the week, Dons coaches indicated Zimmer was physically about 85 percent, and they expected him to start, but he hasn't progressed as they'd hoped. He's expected to return to action next weekend.

For more on Zimmer see this earlier blog post.