The Winter Olympics medal hopes of Team GB's men's curlers have been cast into doubt after a shock 8-6 defeat by Norway left them scrambling to make the semi-finals in Cortina.

Bruce Mouat's world champions had lost two of their opening six matches, and were expected to beat the Norwegians for their fifth victory of the competition.

Leading 4-2 after six ends, they appeared to be in good shape. But a few untimely errors, combined with a disciplined display by their unheralded opponents, left them 6-4 down with two ends left.

Mouat's attempted triple takeout in the penultimate end was a fraction out, but still yielded two to level the scores going into the last. However, Norway held their nerve with the hammer to close out an unexpected victory.

Given results elsewhere,, external five wins might still prove to be enough to reach Thursday's semis.

But the British rink will need to beat both Canada on Tuesday and the United States the following day (both 18:05 GMT).

"We need to win our next two to make sure we're definitely in the semis," lead Hammy McMillan told BBC Sport. "We're doing a lot of the right things, we just need to find that extra inch."

The women's rink are not well-placed, either, but they did deliver their best in the biggest moment to beat Denmark 7-2 and keep their hopes alive.

Having lost three of their opening four, Rebecca Morrison's rink need victories in at least four of their final five matches to have any chance of salvaging a place in Friday's last four - and they began that quest well.

An aggressive start was rewarded with an early 2-0 advantage and the British rink led 3-2 at the break.

Another fine two-point haul in the sixth, followed by a steal in the seventh, opened up a four-point gap with three ends to play and the Scottish quartet closed out the win.

They are back on the ice against Switzerland at 18:05 GMT in another must-win contest, live on the BBC.

Team GB's Niall Treacy suffered his third crash in as many short track speed skating events as his Winter Olympics ended when he failed to progress from the 500m heats.

The only British representative in short track, Treacy surprisingly reached the 1500m final on Saturday but crashed out and then also fell in the 1,000m heats.

The 25-year-old says the shortest distance is his least favourite, declaring himself to be "not a natural sprinter".

Treacy had a wobbly start as he was clipped on the opening corner by South Korea's Rim Jong-un - an 18-year-old high school student who won bronze in the 1,000m - to require a restart.

But there was no reprieve for Treacy, as he skidded out midway through the full race under no pressure.

It ends British interest in short track, and the sport has struggled since losing £4.8m in UK Sport funding after failing to win a medal at PyeongChang 2018.

GB sent a team of five to short track events eight years ago - but that is down to one in Milan.

Dutchman Jens van'T Wout, who has already won both the 1,000m and 1500m, remains in the hunt for a golden treble after avoiding a mass pile-up to win his heat.

The remainder of the 500m competition - with two further knock-out rounds before the final - takes place on Tuesday.

British two-man bobsleigh team Brad Hall and Taylor Lawrence suffered a disappointing start to their Olympic campaign - now sitting eighth at the halfway point of the competition.

Their combined time of 1:51:54 after two heats leaves them 1.64 seconds off the pace of German team Johannes Lochner and Georg Fleischhauer in top spot with two more German teams occupying the other podium places before Tuesday's medal-deciding runs.

Hall and Lawrence, who is a serving Royal Marine, were unable to improve on their run-one position after a heavy bump near the top of the track on their second heat led to more errors and a struggle to make up time.

"It was definitely a very difficult day. The track is extremely difficult to be consistent down, especially in a bobsleigh," said Hall, who is GB's most decorated bobsleigh World Cup pilot.

"We didn't quite do well enough on our second run, we lost quite a bit of time to some and gained on others. We need to go back to the drawing board and see what we can do better tomorrow."

Pilot Hall will also lead the charge for a medal in the four-man event later this week. While Germany's Francesco Friedrich, who is currently third, is aiming to do the treble double - win two and four-man gold for the third Games in a row.