Perry Baker shows how he has helped turn the United States into a world force in sevens rugby.

World Rugby is reportedly facing rebellion among its world series sevens teams after drastic changes to tournament formats.

The men's teams are unhappy with losing the quarter-finals from the looming tournaments in Hamilton and Sydney.

They fear it will affect their Tokyo 2020 Olympic qualification hopes and there are suggestions they could take their concerns to the the International Court of Sport Arbitration (CAS)

GETTY IMAGES New Zealand's Ngarohi McGarvey-Black scores to help win the Cape Town Sevens final against South Africa.

The first two legs of the 2019-20 world series series in Dubai and Cape Town were played over three days with both men's and women's teams involved.

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But the next two events, also involving men's and women's teams, will see the tournaments streamlined to two days.

AP The New Zealand women's sevens team were triumphant in Dubai.

That sees the men's quarterfinals dropped in a cut-throat system that has the four group winners advance directly to the semifinals with the second-placed teams dropping out of the running for the cup.

Winners of the three women's pools will be joined by the best second-placed team in the final four.

"Players and coaches are angry. Not only do the changes negatively affect the draw for the Olympics, but it also jeopardises the integrity of the game and the enjoyment of playing," one international sevens coach told South African newspaper Rapport , confirming they were considering further objections.

"The players have no problems with the current format – where each team earns points in each tournament.

"The International Rugby Players Association (IRPA) is aware of the dissatisfaction and we are considering approaching CAS to get involved. It could also involve the Olympics committee.

"Unfortunately, all the decisions were made by a few individuals at World Rugby who ignored the advice and input of the players, coaches and high-performance managers in an attempt to take the series forward."

Duncan Johnstone/Stuff Edward Osei-Nketia showed off his speed in sprint sessions at sevens rugby training in Auckland.

The HSBC World Rugby Sevens Series 2020 has a record six combined men's and women's events on the current schedule as the sport's bosses look for more synergy and ways to boost the fast-growing women's game.

The Hamilton tournament is being played on January 25-26 with Sydney to follow on February 1-2.

South Africa won in Dubai and New Zealand in Cape Town to share the lead at the top of the men's table with 41 points with two of the 10 tournaments completed.

The women have played three of their eight tournaments with a women's only event starting the campaign in the United States where America won at home.

New Zealand won in Dubai and South Africa to open a six-point lead over Australia at the top of the women's points table.