The two-hour season ender of Grey's Anatomy has won Tuesday's ratings for Channel 7.

An estimated 1.3 million viewers watched the medical staff of Seattle Grace hospital get confined when a grieving widower became an indiscriminate shooter and decided to take out the people involved in the decision to pull the plug on his wife's life support.

Social networking sites, including Twitter, were flooded with fans praising and making comments that the episode, its cast and writer and creator Shonda Rhimes should be Emmy contenders, and speculate on season seven, which has its debut in the US in September and Channel 7 next year.

Grey's Anatomy was at No. 5 for the night for Channel 7, which also had some success with its new game show Minute To Win It, getting the ninth spot.

Channel 10's MasterChef Australia ranked first in ratings, with 1.8 million viewers, and sitcom import Modern Family at No. 4 with 1.5 million viewers, but it was not enough to bump the network out of second place.

Viewers will soon say goodbye to Underbelly: The Golden Mile on Sunday (8.30pm, Nine, NBN), but will be able to watch returning favourites, including Dancing With The Stars (Sunday, 6.30pm, Seven, Prime), and enjoy sportscasts, including the soccer World Cup from South Africa (SBS) and tennis from Wimbledon (Nine, NBN).