I love the clean simplicity of it. His serve is probably super reliable thanks to no-wasted-motion, an ideal toss height for full extension, and fast delivery that allows him to strike the toss near the apex. An added benefit is that it rushes an opponent used to facing many drawn-out serves. It likely holds up extremely well when he's tired or facing bad wind conditions. I teach this approach.
Check it out in Slo-Mo.
