What happened: The Chicago White Sox have signed veteran right-hander Javy Guerra to a minor league contract. Guerra, 30, joins the organization after being released by the Atlanta Braves' Triple-A affiliate earlier this week.

Why it matters: The White Sox currently hold a narrow lead in the AL Central and are seeking to fortify their bullpen for the summer stretch. Guerra offers elite arm strength with a fastball that touches 100 mph, representing a low-risk option to bolster pitching depth.

What to watch: Guerra is expected to report to Triple-A Charlotte to refine his command before contending for a major league call-up.