The final squads of 12 have been declared by all 28 coaches with 16 nations to compete in the sixth round of the HSBC Sevens World Series and 12 regional qualifiers - two from each World Rugby region - to compete for one place as an ever-present team on the 2015-16 series.

FINAL SQUADS OF 12 FOR ALL 28 TEAMS ANNOUNCED >>>

Two former Sevens Player of the Year winners return for the All Blacks Sevens, the defending champions in Hong Kong, in Tim Mikkelson and DJ Forbes, with the players set to make their 53rd and 71st event appearances respectively. Gordon Tietjens also names two debutants in Jordan Bunce and Lewis Ormond.

Shannon Walker returns for Australia after 14 months out with injury with Bradley Wilkin in line to make his first appearance for Australia on the Series. South Africa are the most experienced side in the main competition, followed by Portugal and then Kenya.

In the qualifier Spain name the most experienced side with nine of their players having played in 10 or more World Series events, while Jamie Hood captains hosts Hong Kong and Rio 2016 hosts Brazil name just two players without any previous World Series experience in Pedro Lopes and Lucas Muller.

WORLD SERIES QUALIFYING FIXTURES >>>

Here we look at some of the players we believe you should keep an eye out for this weekend in Hong Kong.

Shannon Walker, Australia: After 14 months out with injury for Australia, Walker returns to the side for the first time under new head coach Geraint John. When fit Walker has devastating pace out wide and has scored one of the former fans' favourite tries on the series. With 37 tries to his name, John will be hoping Walker can stay fit and help his side cement their spot in the top four of the series as they look to qualify for the Olympics automatically.

Dan Norton, England: Norton returns to the England side having missed the last two rounds. The wing will be chomping at the bit to continue his good form this season and improve on his 175 career try-tally, as Simon Amor's side look to force their way into the top four, a place they have not been since the opening round of the season.

Pio Tuwai, Fiji: Ben Ryan has recalled Tuwai on form for the Hong Kong Sevens, a player that can most recently be remembered for that magical pass to set up Emosi Mulevoro in Fiji's defeat of New Zealand in Dubai last season. Alongside captain Osea Kolinisau, who also memorably came off the bench in 2013 to score a hat-trick and help Fiji beat Wales to the title, Ryan will be hoping two of his most experienced players, with 58 events between them, can guide them to a third title this season.

Frankie Horne, South Africa: While Senatla, Afrika and du Preez often make the headlines, Horne provides them with a platform to perform from. Set to make his 65th appearance, Horne is the stalwart of the team. Yet to win in Hong Kong, however, the likes of emerging talents Kwagga Smith and Werner Kok will be hoping to help Horne break the duck of the Blitzboks in Hong Kong, and a win here would take them all a step closer to a second World Series title.

Vladimir Ostroushko, Russia: If Russia are to have any chance of qualifying as a core side for the next series Ostroushko will need to be at his very best under the captaincy of Dmitriy Perov. With 60 tries in 18 Series events Ostrouhsko has an eye for the try-line and also appeared at Rugby World Cup 2011 so has the experience to help guide his side through the competition.