Nick Woodbridge and Sam Weale both finished with 17 wins from 35 fencing bouts as they got their Olympic modern pentathlon campaigns under way at the Copper Box.
In this most unpredictable of sports, both British athletes began with hopes of a medal but 808 points was a little below par for Woodbridge in particular.
The world number nine was on top form to start with, winning his first five bouts and at one stage topping the leaderboard, but he tailed off and finished in joint 13th.
The format in pentathlon involves each of the 36 men fighting each other in one-minute bouts, with one hit enough for victory.
Weale's morning progressed in the opposite way to his team-mate's, with the 30-year-old losing seven of his first nine bouts but recovering to finish in the top half of the field.
After completing the fencing, the athletes headed over to the Aquatics Centre for the second event of the pentathlon, the 200 metres freestyle swim.
The swim is one of Woodbridge's best events and his time of one minute 57.32 seconds was the second fastest of the day and enough to move him up to eighth place.
Weale swum his fastest time of the year, 2min 03.40sec, and will go into the next event, the show jumping at Greenwich Park, sitting in 14th place.
The riding phase is often a game changer, though, with athletes drawing horses at random and then having only 20 minutes to acquaint themselves with their animal.