Sports Info Solutions offers a comprehensive scouting report on Japanese pitching star Roki Sasaki. They delve into each pitch, but also present nuggets like this:

One last note on the splitter is that Sasaki loves to use the rosin bag provided in NPB games and with no pitch clock he routinely goes to the bag, almost as if it’s part of his routine. He’ll be throwing with a different ball in MLB and it will be fun to see what grip he goes with and how he navigates using the rosin bag behind the mound within the confines of the pitch clock. 

SportsInfoSolutions.com

Well worth the read.