Former winners AC Milan and RB Leipzig secured the last available round of 16 berths in the Champions League with emphatic wins in their deciding group showdowns on Wednesday. Olivier Giroud scored twice and set up the others as Italian champions Milan defeated Red Bull Salzburg 4-0, and German Cup winners Leipzig prevailed with the same 4-0 scoreline at Shakhtar Donetsk. Title holders Real Madrid and Benfica clinched first place in their groups on the concluding night of the group stage. Real thrashed Celtic 5-1 while Benfica scored two late goals in a 6-1 at Maccabi Haifa to edge out Paris S…