<i>The Block Sky High</i> winners Lysandra, left, and Alisa Fraser.

Hot property: The Block Sky High winners Lysandra, left, and Alisa Fraser. Photo: Katherine Griffiths

More than 3 million Australians watched twins Alisa and Lysandra win The Block Sky High last night.

The "winner announced" segment of the two-hour marathon Block finale gave Channel Nine the second highest-rating show of the year - just behind the "winner announced" segment of Seven's My Kitchen Rules in April, which had 3.27 million viewers.

Dan and Steph Mulheron

Reigning supreme: Dan and Steph Mulheron won this year's My Kitchen Rules series. Photo: Supplied

The "auctions" portion of the program netted 2.6 million viewers and the remainder lured 2.1 million.

Overall, the three segments were the three top-rating programs of the night - even though to viewers, they appear to be one long program. (For the past few years, networks have sneakily split the final episodes of reality shows into different segments so they can dominate the top 10 ratings list.)

Nine's capitalised on The Block by launching a new season of Underbelly called Squizzy, inspired by a Melbourne gangster from the 1920s.

The first of the two Underbelly episodes drew an audience of 1.5 million - trouncing the debut of BBC drama Ripper Street on Ten, which attracted a disappointing 579,000 viewers.

The second episode of Underbelly fell to 1.09 million - a loss of more than 440,000 viewers.

Ten's MasterChef - its highest-rating program for the night came No. 13 overall - also underperformed with an audience of 606,000.

The Block and Underbelly helped the Nine Network, including its digital channels Gem and Go!, claim a massive 40.7 per cent of last night's audience.

The Seven Network was well behind with a 25.6 per cent share. Its top show for the night was Seven News, coming in at No. 6 overall with 1.4 million viewers.

Seven's flagship current affairs program Sunday Night - hosted by outgoing Sunrise presenter Melissa Doyle, who filled in for Chris Bath - had an audience of 1.07 million.

But Seven was still streets ahead of the Ten Network's 15.4 per cent share, which was closely followed by ABC's 14.2 per cent.

The SBS channels drew 4 per cent of the audience.

MOST-WATCHED TV SHOWS ON SUNDAY:  

1. The Block Sky High Winner (Nine)- 2.808 million

2. The Block Sky High Auctions (Nine) - 2.606 million

3. The Block Sky High Grand Final (Nine) - 2.132 million

4. Underbelly: Squizzy Launch (Nine) - 1.679 million

5. Nine News Sunday (Nine) - 1.540 million

6. Seven News Sunday (Seven) - 1.433 million

7. Underbelly: Squizzy Episode 1 - (Nine)- 1.148 million

8. Sunday Night (Seven) - 1.071 million

9. Grand Designs (ABC1) - 890,000

10. Highway Patrol (Seven) - 821,000   

Source: OzTAM/AAP