The White Sox announced Monday that Hendriks began his last round of chemotherapy to treat non-Hodgkin lymphoma.
Though a timetable for the closer's return isn't yet clear, the White Sox didn't place Hendriks on the 60-day injured list prior to Opening Day, creating hope that he could be back before the end of May. Reynaldo Lopez has notched the team's lone save so far in the early going.