The Simon Cowell reality contest's final auditions show of the series - featuring synchronised swimming group Aquabatique - grabbed 9.82m (38.9%) at the later time of 8.45pm, peaking with 11m and adding a further 321k on ITV1 +1.
Britain's Got More Talent aired immediately afterwards on ITV2, picking up 1.08m (6%) at 10.15pm.
Meanwhile, The Voice UK anchored BBC One's night with 8.16m (35.6%) between 7.10pm and 8.45pm, losing momentum over its ITV rival but still performing strongly.
Pointless Celebrities (2.42m/12%) and My Family (2.23m/10.2%) were screened before The Voice to low audiences, while In It To Win It (4.41m/18%) and Casualty (4.04m/16.9%) aired later on.
ITV1's FA Cup final coverage scored an average of 5.42m (31.9%) from 3.15pm, peaking with 11.5m as the match drew to a close. The Cube then took 3.46m (15.1%).
A BBC Two tribute to snooker legend Ray Reardon pocketed 1.08m (4.5%) from 8pm, then I Love 1977 had 1.49m (6.3%).
Channel 4's showing of Mission Impossible entertained 1.01m (4.3%) on Channel 4 (+1: 159k), while CSI: NY was Channel 5's best-rated programme with 1.28m (7.3%).
Overall, ITV1 topped primetime with 27%, overtaking BBC One which had 24.2%. BBC Two claimed third place with 5.7%, ahead of Channel 4's 4.2% (+1: 0.6%) and Channel 5's 3.8% (+1: 0.2%).
BBC Four's foreign drama The Bridge climbed to 848k (3.4%) and 672k (3.3%) for its double bill.
BARB ratings data supplied by Attentional