The punishing right-hander has made a brilliant start to the twenty20 tournament and there was no let-up at the University Oval yesterday.
He paced Otago's innings with a fine 70 not out from 53 deliveries to help chase down Wellington's middling total of 139 for six.
The 31-year-old had wonderful support from Anaru Kitchen, who played the early aggressor with 44 from 42 deliveries.
The pair put on 105 for the first wicket to set up the seven-wicket win.
Broom lifted the tempo in the 14th over, attacking the bowling of Luke Woodcock. He hit the left-arm spinner for a towering six which easily cleared the sightscreen and media box.
The next delivery was dispatched over extra cover for a boundary and he added a second six as well for good measure.
That over effectively sealed the win but Otago lost three wickets before Broom sliced a shot down to the third man boundary to clinch the win with an over to spare.
It was a comprehensive performance enriched by some pretty decent bowling.
Fast bowler Warren Barnes has been impressive since moving south from Auckland. His extra pace caused a few problems and his haul of one for 17 from four overs represented fair reward for a very solid effort.
Veteran left-armer Bradley Scott had a forgettable opening over but rebounded well. He picked up two late wickets with some smart bowling and finished with three for 25 from his four overs.
Part-time left arm spinner Kitchen opened the bowling and did a marvellous job plugging up an end for three overs. He also picked up the wicket of Alecz Day.
But the day belonged to Broom. So far, he has scored 211 runs in the tournament and, because he is been out just the once, that is also his average.
''When he wants to turn it on he just does. And when he just needs to rotate the strike he does that also,'' Otago coach Nathan King said.
''At the moment, all facets of his game are going really well. And, as you say, he is just controlling the pace of the innings.''
While Broom appeared in complete control at the crease, no-one in the visiting side's line-up looked in on pitch which was not always easy to score on.
Makeshift opener Day top-scored for Wellington with 38 runs, but he used up 49 balls getting there. He hit one chunky blow for six but he did not time the ball at all well.
Craig Cachopa was busy at the crease but his promising innings was cut short when he carved the ball straight to Broom at backward point.
Tom Blundell (20 from 16) played some shots at the death but Wellington's total was probably 20 runs short.
The win means Otago has strengthened its position at the top of the competition standings with three wins from four games.
''We've got on a bit of a roll now and it is good to be in the position we are now,'' King said.
''[The key was] holding our composure. They made us work hard for wickets. We did not get a lot of wickets up front but we hung in there and just kept working away.
''We just defended really well towards the back end of our innings.''
In the other games, Auckland beat Central Districts by 10 runs in a high-scoring fixture at Eden Park Outer Oval. In all, a world-record 31 sixes were hit (17 by Auckland and 14 by CD).
The Aces posted 217 for four, Colin Munro hitting 89 from 40 deliveries. Will Young returned fire for Central with 96 from 50.
In Whangarei, Northern Districts beat Canterbury by 12 runs. Corey Anderson swatted 42 from 18 to help his side reach 172 for eight.
Aiden Blizzard offered Canterbury some hope with 69 from 53 but the Kings were restricted to 160 for six.
