Career stats for Masahiro Tanaka in the Japanese Pacific League jpl
Apparently the Cubs and Yankees are scouting this player now. WAA shows player value in whatever league the model is run. Each league is its own ecosystem. The average player in MLB should be much higher than the average player in jpl. There probably is a number describing the difference between jpl and MLB, but that’s not really necessary to know — if you can ever really know. This is where good old fashioned scouting comes into play. The WAA model focuses on different types of stats than used by systems like Sabermetrics. Much of Sabermetrics stats need to be examined to determine if this pitcher can make it in the MLB. It’s quite possible he pitches a +10 WAA in MLB. That’s a $30M player. He could also pitch -5 WAA in MLB or anywhere in between. Assessing that risk and assigning numbers to it is not easy.