Roby has double-double; Nebraska beats Northwestern 59-50

Nebraska's James Palmer Jr. (0) dunks as Northwestern's Dererk Pardon (5) watches during the second half of an NCAA college basketball game in Lincoln, Neb., Saturday, Feb. 16, 2019. (AP Photo/Nati Harnik)

Northwestern coach Chris Collins, left, reacts after a turnover during the second half of an NCAA college basketball game against Nebraska in Lincoln, Neb., Saturday, Feb. 16, 2019. (AP Photo/Nati Harnik)

Northwestern's Anthony Gaines (11) dunks as Nebraska's Glynn Watson Jr., left, Tanner Borchardt, second left, and Thomas Allen, right, watch, during the second half of an NCAA college basketball game in Lincoln, Neb., Saturday, Feb. 16, 2019. (AP Photo/Nati Harnik)

Northwestern's Vic Law, foreground, reacts after a basket and a foul against Nebraska during the second half of an NCAA college basketball game in Lincoln, Neb., Saturday, Feb. 16, 2019. (AP Photo/Nati Harnik)

Northwestern coach Chris Collins reacts during the second half of an NCAA college basketball game against Nebraska in Lincoln, Neb., Saturday, Feb. 16, 2019. (AP Photo/Nati Harnik)

Nebraska coach Tim Miles, right, reacts after a travel call against James Palmer Jr. during the second half of an NCAA college basketball game against Northwestern in Lincoln, Neb., Saturday, Feb. 16, 2019. (AP Photo/Nati Harnik)

Nebraska's Isaiah Roby (15) blocks a shot by Northwestern's Aaron Falzon (35) during the second half of an NCAA college basketball game in Lincoln, Neb., Saturday, Feb. 16, 2019. (AP Photo/Nati Harnik)

Northwestern's Vic Law (4) tries to drive around Nebraska's Glynn Watson Jr. (5) during the second half of an NCAA college basketball game in Lincoln, Neb., Saturday, Feb. 16, 2019. (AP Photo/Nati Harnik)

Northwestern's Anthony Gaines (11) shoots against Nebraska's James Palmer Jr., left, during the first half of an NCAA college basketball game in Lincoln, Neb., Saturday, Feb. 16, 2019. (AP Photo/Nati Harnik)