The initial men's pool stage concluded on day three of the Sitting Volleyball World Championships in Sarajevo ©World ParaVolley/Flickr

Hosts Bosnia and Herzegovina and holders Iran finished top of their respective pools after the opening stage of the men's Sitting Volleyball World Championship.

Iran finished the initial pool stage undefeated as they overcame Croatia 25-18, 25-15, 25-16 in Pool B.

Meanwhile, hosts Bosnia and Herzegovina won their third successive game in Pool A as they overcame Japan 25-8, 25-14, 25-15 at the Hotel Hills Arena in Sarajevo.

Elsewhere in Pool A the United States overcame Serbia 25-17, 25-22, 25-13 while the day’s other Pool B contest saw Kazakhstan beat Iraq 25-13, 25-17, 25-19.

Brazil topped Pool C courtesy of a 25-23, 25-14, 25-9 win over Canada, while the other group game saw Germany beat Poland 25-18, 25-16, 25-19.

Egypt finished Pool D unbeaten and top of the standings thanks to a 25-19, 25-15, 25-12 win over Rwanda.

The pool’s other match saw Ukraine overcome The Netherlands 25-18, 25-17, 25-15.

Following the conclusion of the initial pool stage, a cross-pool round of games is scheduled for tomorrow, to determine which teams will go to the quarter-finals, with the remainder then playing a series of classification matches to determine the remaining places.

In the women’s competition, three-time runners-up the United States were involved in a thrilling five-set encounter with neighbours Canada, with the US coming out on top 22-25, 25-22, 21-25, 25-12, 15-7 in the Pool B fixture.

Later in the day, Canada were in action again, winning 25-10, 25-14, 23-25, 25-13 against Iran.

In Pool A, Ukraine registered two wins today to sit top of the pool, overcoming Poland 25-8, 25-18, 25-12 and then hosts Bosnia and Herzegovina 25-2, 25-9, 25-11.

The pool’s other match saw Poland overcome Hungary 25-21, 25-18, 25-12.

In the day’s Pool C matches Brazil beat Italy 25-17, 23-25, 25-12, 25-21, before Italy overcame Germany 25-18, 17-25, 25-12, 25-19.

The final day of pool play in the women’s competition is due to take place tomorrow.