Trent Giambrone is in a groove. Again. Or still. At any rate, the former Delta State star has homered in three straight games and four of his last five at Triple-A Iowa. He has lifted his average to .302 through 10 games in his first hack at this new level. Giambrone spent most of spring training in the Chicago Cubs’ big league camp as a non-roster invitee and batted .324 with two homers in 34 at-bats. That came after a .327 showing in the Arizona Fall League, which came on the heels of a 17-homer season at Double-A Tennessee. The 5-foot-8, 178-pound infielder, 25, isn’t rated among the Cubs’ best prospects but surely is on the big club’s radar. (Though it isn’t currently lacking infield talent, the big club is 6-9.) “I’m just trying to hone in on my approach, take it day by day and not really think about the big picture of anything else and just be myself, mainly,” Giambrone recently told the Des Moines Register.