Rublevska racked up 25 wins, which earned her 1,000 points, while Hungary's Adrienn Toth was one win behind.
The woman who was probably happiest, though, was Lithuania's world number one Laura Asadauskaite, who often makes up a lot of places in the final combined run and shoot.
She may not need to match that this time after finishing third in the fencing with 23 wins.
The next event is the 200m freestyle swim, before the athletes head to Greenwich Park for the jumping and the combined event.
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