Al Horford moves for the Boston Celtics against Lauri Markkanen of the Chicago Bulls at the United Center on March 5, 2018 in Chicago, Illinois. (Photo by Jonathan Daniel/Getty Images)

Al Horford moves for the Boston Celtics against Lauri Markkanen of the Chicago Bulls at the United Center on March 5, 2018 in Chicago, Illinois. (Photo by Jonathan Daniel/Getty Images)