By Zach Koons The L.A. starter called out MLB for providing “slick” baseballs to pitchers this season. View the original article to see embedded media. Angels starting pitcher Michael Lorenzen blasted the baseballs currently used in MLB after hitting Mariners outfielder Justin Upton in the head Friday. Upton, who had been called up earlier in the day and was making his season debut, was facing Lorenzen in the fifth inning when he was struck in the helmet by a 90.6 mph pitch. He went down to the ground and stayed there for a few moments before he was eventually able to leave the field. Upton di…