Julio Urias' biggest mistake may have been that he exhaled.
The 19-year-old Dodgers left-hander lived up to billing as one of baseball's top pitching prospects in his first spring inning Friday, striking out the side — Geovany Soto, Gregorio Petit and Todd Cunningham of the Angels — with a fastball that was clocked between 92 and 97 mph and a sharp slider.
"The first inning, the adrenaline was flowing and I pitched well," Urias, a native of Mexico, said through an interpreter. "I tried to relax in the second inning, take a few deep breaths, and it didn't work out the way I wanted it to.