China upset hosts USA at Curling World Cup
Zou Qiang skipped his Chinese team to an upset victory over Olympic champions USA on the opening day of the Curling World Cup.
They upset the home fans with a 4-3 victory in Omaha, in a match where neither team scored more than one point in any end.
Elsewhere Scotland opened their account with a win following up their maiden triumph at the European Curling Championships last month.
Bruce Mouat skipped the side to an 8-6 victory over Canada thanks to a four-point score in the sixth end.
He said: "That four really changed the tide of the game. We were struggling to make some simple shots before that.
"Grant [Hardie] did a really good runback to set me up for that four and we had a nice team shot to finish off with that pack break."
Sweden and Norway both had comfortable victories against Japan and Switzerland respectively.
Meanwhile, the women's Olympic champions Sweden were handed an opening day defeat at the hands of Japan at the Ralston Arena.
Anna Hasselborg had led her crew to five competition wins in a row since September, including the European Championships, but they lost on after a measure in the final end, which gave Japan three points as Satsuki Fujisawa guided her team to a 6-5 victory.
Hosts United States were dominant in a 9-5 win over South Korea while Scotland cruised past China 7-1 in seven ends and Canada grabbed an opening day win as they beat Russia 7-5.
Elsewhere, Switzerland's Jenny Perret and Martin Rios were victorious on a one-stone shoot out in the mixed doubles as they beat Canada's John Morris and Kalynn Park 6-5.
The victors drew within 8.7cm of the button compared to 18.5cm for the Canadian duo.
It was the reverse of the result when the two countries contested the gold medal match at the Olympics in PyeongChang earlier this year.
The American, Korean and Russians pairs all opened their accounts with victories while Norway, China and Sweden will be looking to get their first wins of the competition on the second day of the round-robin.