UPDATED 2:40 PM with final ratings: Monday was a Clash of the Titans night, with tennis greats Venus and Serena Williams facing off in Indian Wells and the two biggest singing competitions on American television this century, The Voice and American Idol, going at each other head to head. It was the 19th meeting between the Williams sisters, which was won by Venus, and the eighth face-off between Idol and The Voice.

It was the incumbent, NBC’s The Voice (2.4 rating in adults 18-49 after upward adjustment, 11.9 million viewers), that came out victorious, topping ABC’s Idol revival (1.8, 8.4 million) by 33% in the demo and almost 3.5 million viewers. It was only the second time The Voice has outperformed Idol when airing opposite each other — in the first seven times the two faced each other while Idol was on Fox, only once, in May 2014, did The Voice manage to edge its older counterpart by a small margin.

The presence of another music reality series barely affected The Voice, whose preliminary demo delivery was off by a tenth from last Monday, and up by 2% in total viewers.

Meanwhile, Idol was down 22% in the demo from its ABC premiere on Sunday (2.2) to mark the series’ lowest Week 2 showing. It also was down by the same amount from The Bachelor finale, which ran on ABC last Monday. Idol, which will only have a few airings on Monday, did improve on ABC’s 8-10 PM season averages in 18-49 and total viewers and gave a lead-in boost to The Good Doctor (1.8, 9.8 million). After a preemption for the three-hour The Bachelor finale last week, the freshman medical drama, already renewed for a second season, was up 38% in 18-49 and 26% in total viewers from its last original to post its best numbers since November.

The Good Doctor easily topped the 10 PM hour competition, which included Week 3 of NBC’s Good Girls (1.0 after a downward adjustment, 4.5 million). The NBC drama is yet to find the bottom, shedding another 0.3 in the demo and 13% in viewers (but is still just above The Brave‘s season average in the hour, 0.9 in 18-49).

Overall, NBC edged ABC (1.9 vs. 1.8 in 18-49, 9.4 million vs. 8.9 million) to reclaim top Monday honors that went to ABC last week on the strength of The Bachelor closer.

There was little movement elsewhere, with CBS airing a mix of comedy originals and repeats. The two originals, Man With a Plan (1.0, 6.4 million) and Living Biblically (0.7, 4.7 million) both were steady in the demo, the latter staying at a dangerously low level.

Fox’s Lucifer (0.7, 2.94 million) matched its demo low from last week while dipping below 3 million viewers for the first time. The Resident (0.8, 3.8 million) dipped a tenth to tie its season lows.

The CW’s Legends of Tomorrow (0.4) was even with last week, while  iZombie (0.3) inched up a tenth after upward adjustment in the finals.