Anthony Ogogo, Anthony Joshua and Nicola Adams are both guarenteed an Olympic medal after winning their respective quarter-final clashes on a mixed day for Britain's boxers at the Excel Arena on Monday.

Ogogo powered to an impressive 15-10 win over Germany's Stefan Hartel in front of capacity crowd to reach the semi-final of the men's 75kg competition and will now face Brazilian Esquiva Falcao, who beat Hungary's Zoltan Harcsa 14-10, in the last four.

"It feels good to be guaranteed a bronze medal, don't get me wrong, but it's not enough," said Ogogo. "I've always dreamed of becoming Olympic champion."

Superheavyweight Joshua may have been lucked to scrape past Erislandy Savon in his first contest, but the 22-year-old looked much sharper against China's Zhilei Zhang as he secured a 15-11 victory that could have been a much wider scoreline.

Joshua knocked his opponent down in the second round with a thunderous right-hand and was on top for the majority of the three minutes, yet was only awarded the round 8-6.

The Watford fighter will now face Kazakhstan's giant Ivan Dychko who stands at 6ft 9" and was a bronze medallist at last year's World Championships.

However, for Team GB's women, only Nicola Adams could qualify from her last-eight clash in the competition's debut at the Olympic Games, as much-fancied reigning world champion Savannah Marshall and Natasha Jones both crashed out.

Adams provided the only bit of joy for British supporters as she overcame Stoyka Petrova of Bulgaria to guarantee herself a medal in the flyweight category.

Anthony Ogogo
Ogogo assured himself a medal.

Adams led throughout the four rounds and never looked to be in any real trouble as she repeatedly landed two punch combinations that shook her opponent. In the final round she switched to southpaw as she boxed beautifully to secure a 17-7 victory.

The Leeds fighter now moves into the semi-finals and will be hoping to make it to the gold medal match-up, but she can relax slightly as even if she loses her next bout she will win a bronze.

Nicola Adams
Nicola Adams is guaranteed a medal after victory in the quarter-finals [Reuters]

In the lightweight category it was always going to be difficult for Jonas as she was up against four time world champion Katie Taylor of Ireland.

The vastly experienced Taylor dominated the bout throughout as she opened up a commanding eight point lead after three rounds. Her speed and footwork were simply too much for the Team GB fighter who was twice issued a standing eight count.

Taylor continued to control the contest and by the end of the fourth round had secured a commanding 26-15 victory as she looks to win Ireland's first medal of the London 2012 Olympics.

"[sic] Its a shame it weren't a final we both gave it everything an I wish her all the best on her journey 2 gold. Thankyou 4 every msg luv u all x" tweeted Jonas after the contest.

The biggest shock of the day came next as Marshall failed to make it through her first contest at these Games. The r21 year old was expected to go all the way after receiving a bye in her first round, but struggled to cope with Marina Volnova of Kazakhstan.

The middleweight fell behind after the third round and had to try and make up a two point deficit in the final two minutes to progress. Despite appearing to get the better of her opponent in the final round, the contest was awarded to Volnova with a final score of 16-12.