Prep lefthander John Lamb, who recently impressed scouts at a showcase event in Compton, Calif., won’t get to build on the momentum he gained in that event due to an injury.

Lamb, a projectable 6-foot-3, 175-pounder with Laguna Hills High, had recurring pain in his left elbow stemming from a car crash last week, and it now has been diagnosed as an avulsion fracture, when a ligament or tendon pulls off a piece of bone. He is expected to miss at least 12 weeks while doctors immobilize and rehabilitate his throwing arm.

Lamb will not have surgery, according to an e-mail his father sent to scouts. He was starting to pitch his way into single-digit draft-round territory after showing improved fastball velocity (touching 91 mph) and a better breaking ball during this month’s Major League Scouting Bureau event at Compton’s RBI facility. Now Lamb probably won’t pitch until mid-to-late May, just before the draft.