Saitō's fastball tops out at 144 km/h. His normal pitch mix includes a vertical and horizontal moving slider, a curveball, a changeup and a splitter.[3] In 2017, he switched to a side-throwing action with the addition of fellow lefty, Daiki Tajima in the first round of the draft, adding more spin to his slider and improving hitting his spots inside.[4] On being traded to the Dragons, under the tutelage of Akinori Otsuka, Saito switched to a three-quarter delivery increasing his velocity and whiff rate with his slider.[5]