Mayor de Blasio boasted Friday that the number of potholes have dropped by more than 50 percent under his watch — and quickly found a skeptic in GOP rival Nicole Malliotakis.

The mayor announced that 207,306 potholes were counted on streets this year — down 53.4 percent from the 444,835 in 2014. He attributed the decline to a $1.6 billion, 10-year investment.

Malliotakis said her own experience led her to conclude the pothole problem hasn’t improved much.

“Anyone who drives on city streets will tell you they’re in disrepair,” she said.