The crowd gave the Australian wild card entrant a rapturous round of applause following the performance which the 33-year-old seemed to thoroughly enjoy.
Sebastian, who was selected by broadcaster SBS to represent Australia, danced on stage alongside his backing singers.
Guy Sebastian, centre, representing Australia performs the song 'Tonight Again' during the final of the Eurovision Song Contest in Austria's capital Vienna, Saturday, May 23, 2015. (AP) Source: AP
In the media centre journalists, bloggers and accredited superfans from around the world sang along and went a little bit crazy while watching the former Idol winner and X Factor judge on big screens.
A phalanx of photographers took pictures of Aussie fans who got to their feet and danced throughout Tonight Again.
Australia is one of the favourites to win the grand final on Saturday night (Sunday morning AEST).
Sebastian performed 12th of the 27 entrants.
He came two spots after the number one favourite - Sweden's Mans Zelmerlow - who has a cool song and even cooler on-stage graphics.
Zelmerlow, 28, also received a huge cheer from the 11,000 fans packed into the arena and the 1000-odd people crammed into the media centre.
The bookies suggest Russia, Italy, Serbia and Belgium are in the hunt too.
On the eve of the grand final Sebastian was talking down his own chances.
"A little competitive side of me just doesn't want to come dead last," he told reporters.
"It wouldn't be nice doing interviews in the morning with Australia and them going 'So you embarrassed us - don't come back'."
Eurovision 2015 is here! Head to SBS Eurovision for all the latest Eurovision news, videos and party tips.
Watch Grand Final Sunday 24 May 7:30pm on SBS ONE
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