Saturday's Medal Race carries double-points and is non-discardable, so the pressure is immense in what is set to be a thrilling 25 minute race around the windward leeward track.
"It is nice to be back on top. We have had a great season, but this has been a really difficult regatta," said Belcher. The team scored a 10, 1 and will start the medal race with a seven point advantage over Greece's Panagiotis Mantis and Pavlos Kagialis.
"We are all trying to get away without any disasters. The fleet is really close, there is a lot of current and it is very shifty," he continued. "If you can start well and be consistent, it doesn't have to be first, you are on track. Today it all came down to the last race. For us, this is the highest scoring regatta we have done in almost 20 events, so it just shows you how difficult it is."
Expectations run high for Belcher as he steps closer to adding another gold medal to his 2012, 2011 and 2010 World Championship collection, which he achieved with former crew Malcolm Page.
The first race of the day and a win to Finland's Lindgren brothers, Joonas and Niklas, who moved up to tenth and closer to the top eight cut, after claiming their first race win of the series. But a topsy-turvy result of 14th in the final race knocked them back to twelfth overall.
Hard to imagine the emotions after racing for France's Pierre Leboucher and Nicolas le Berre, the series leaders going into the day, who ended the final series in 4th overall after posting finishes of 13th and 20th, and sit a massive 17 points behind the Australians. The gold medal is out of reach, but they still have a shot at silver or bronze.
Results of 2,5, take Panagiotis Mantis and Pavlos Kagialis a step closer to claiming their first ever World Championship victory, and improving on their performance best of fifth at the 2010 Worlds.
"It was a difficult day. All the boats were very close and we gave our best and never stopped sailing and keeping an eye on the others," said Kagialis. "We enjoyed the day and are waiting for tomorrow! We will race our own race and not think too much about the others, as a small mistake will be very painful!"
Belcher and Ryan are assured of a medal, with only the Greeks or third placed Lucas Calabrese and Juan de la Fuente (ARG) are able to grapple the gold from them. The battle for silver extends to all of the four top teams, with Great Britain's Luke Patience and Joe Glanfield adding to the top five team mix who can challenge for bronze.
Across the seven race final series, a different team has won each race - clear evidence of the tough conditions and depth of talent competing.
The 470 Men Medal Race is scheduled to get underway at 14:45.
470 Men - Top 5 Overall
1. Mat Belcher and Will Ryan (AUS) - 32 pts
2. Panagiotis Mantis and Pavlos Kagialis (GRE) - 39 pts
3. Lucas Calabrese and Juan de la Fuente (ARG) - 45 pts
4. Pierre Leboucher and Nicolas Le Berre (FRA) - 49 pts
5. Luke Patience and Joe Glanfield (GBR) - 58 pts
6. Stu Mcnay and Dave Hughes (USA) - 69 pts
7. Sofian Bouvet and Jeremie Mion (FRA) - 78 pts
8. Paul Snow-Hansen and Daniel Willcox (NZL) - 81 pts
Jo Aleh and Polly Powrie advance to the Medal Race with an eleve point lead, and bar a scoring penalty are assured of a medal. They didn't make it easy for themselves after a 13th in the first race of the day, although a third place follow up put them safely back into the lead.
"It was really hard. We had big shifts and choppy seas and most of the time you had to go with your gut feeling," said Powrie. "It was sail your own race. We had a bit of a shocker in the first one and then managed to sort ourselves out for the next."
"This year is a bit different for us," added Aleh. "We have had some time off and come back, although we feel a bit rusty. We didn't have a great day today, so I was a bit surprised to come in and find we were doing this well."
At the 2012 470 World Championships in Barcelona, Aleh and Powrie lost out in the winner takes all Medal Race between four boats. This year their prospects are not quite so risky, so a different strategy will no doubt be discussed to mitigate any chance of losing out on World Championship glory for the second year running
In second overall are Austria's Lara Vadlau and Jolanta Ogar, with the 2012 World Champion silver medallists and reigning European Champions Camille Lecointre and Mathilde Geron from France in third.
The opening race of finals day went to Australia's Elise Rechichi and Sarah Cook, with China's Xiaoli Wang and Xufeng Huang in second and Xiaomei Xu and Chunyan Yu in third. This result left the Australians in ninth overall and just one point off the Medal Race cut, which only served to motivate them to follow up with a second place finish and advance to the Medal Race in sixth overall.
A stunning outcome for the two Chinese teams who have both qualified to the Medal Race.
The points are very close in the 470 Women fleet and in theory all of the eight teams are in with a chance of a medal, so expect a fierce battle to the podium.
470 Women - Top 5 Overall
1. Jo Aleh and Polly Powrie (NZL) - 29 pts
2. Lara Vadlau and Jolanta Ogar (AUT) - 40 pts
3. Camille Lecointre and Mathilde Geron (FRA) - 43 pts
4. Xiaoli Wang and Xufeng Huang (CHN) - 46 pts
5. Sophie Weguelin and Eilidh McIntyre (GBR) - 53 pts
6. Elise Rechichi and Sarah Cook (AUS) - 55 pts
7. Tina Mrak and Veronika Macarol (SLO) - 55 pts
8. Xiaomei Xu and Chunyan Yu (CHN) - 59 pts
The Medal Races are scheduled to start at 14:00 on Saturday 10 August 2013, with the 470 Women up on the race track first, followed by the 470 Men at 14:45. The Medal Ceremony will take place at 18:00 at La Société des Régates Rochelaises.
The Championship format splits the 470 Men into three fleets and the Women in two, to race the qualification stage of five races over two days, with one discard. After the qualifying stage, the 470 Men teams split into gold, silver and bronze fleets, based on their position on the leaderboard, and carried forward (C/F) their leaderboard position into the finals stage of 7 races over three race days. A second discard is allowed during the finals stage, but not the C/F score.
Scoring is 0 points for 1st, 2 points for 2nd and so on during the qualification and finals stage. The top 8 in each fleet proceed to the medal stage on Saturday 10 August for a single Medal Race with a double points score, where 1st equals 2 points, 2nd equals 4 points and so on.