I think he means R2, where in you can see the pitch history of the last at-bat or last pitch for that current swinger, that way you have a rough idea of what might the pitcher throw and where.
I usually follow this guide though when batting:
0-0 = Likely a fastball or a curve ball. Sometimes can be down the middle, often times painting the corners (Pitchers like to stay away from ball 1).
0-1 = Will throw outside the strike zone, or around the corners. Mostly the former.
0-2 = If you chased the previous two outside the strike zone, the CPU will 100% throw something out of the strike zone. If you didn't chase, expect a breaking pitch around the corners.
1-0 = Pitcher will usually rebound with a fast ball in the strike zone, but likely around the corner.
2-0 = Pitcher will fastball or running fastball on the corners.
3-0 = Fastball, every time. Will always be in the box.
Now for where it gets tricky:
1-1 = Can be anything.
1-2 = Same
2-1 = Usually a breaking ball on the corners.
2-2 = Breaking ball. Guaranteed.
3-1 = Fastball in the corners.
3-2 = Fastball in the zone.