NBC's latest auditions show took 10.9m (3.0) in the 9pm hour, down 1.3m and four demo points week-on-week.
However, the Peacock Network's Love in the Wild was unaffected by the clash, drawing a consistent 5m (1.6) at 10pm.
Finally, American Ninja Warrior - airing at 8pm - fell to 4.9m (1.6), meaning NBC finished third in primetime.
Hell's Kitchen (5.3m/2.1) and MasterChef were solid (4.9m/2.1) as Fox was runner-up behind ABC.
Jimmy Kimmel Live kicked the Alphabet Network's night off with 6.2m (2.2), then coverage of the NBC Finals averaged 13.2m (5.6).
Though the overnight data for the basketball is subject to change, it is certain that it easily topped the night in terms of both total viewers and 18-49 adults.
The CW's Catalina continued with 650k (0.2) in the 8pm junction, losing a point on last week's edition.