Greece Flag
Courtesy of: Richard Mackson-USA TODAY Sports
FINA World Championships editorial coverage is proudly sponsored by SpeedoUSA. For all the latest coverage, check out our event coverage page.

BARCELONA, Spain, July 22. THE first day of men's water polo clashes began with a shocking upset at the FINA World Championships being held in the Picornell Pool.

Greece pulled off a shocker with a 6-4 victory over Montenegro in the opening contest of the day. Greece jumped out to an early lead with a 3-0 advantage and held on to wind up triumphant.

"We believe we can win every match. We are at the same level as any other team," said Ionnanis Fountoulis.

A match-up of a pair of Olympic champions took place in the second match of the day with Croatia downing Team USA 9-7. USA is now being led by former Serbian head coach Dejan Udovicic and his reign did not start off on the right foot.

In another highlight contest, Olympic bronze medalists and World League champion Serbia held off a game Australia, 10-7 with Filip Filipovic and Vanja Udovicic both scoring hat tricks.

"I think we deserved this win and it's a good way to open the tournament. I hope we keep up with this rhythm when we play against Hungary in the next game," said Serbia's captain Udovicic.

In other action, Canada trumped South Africa (17-11); Hungary squashed China (13-5); Italy downed Romania (10-4); Germany squeezed by Kazakhstan (9-8) and Spain crushed New Zealand (18-3).

Results: FINA World Championships, Water Polo: Day Two