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Batting average on balls in play (BABIP) tells us how many struck balls land safely for a hit. It is park-and-league adjusted, so there is an even playing field.
You can use BABIP to predict regression for a player. If a hitter or pitcher runs a BABIP higher or lower than their career norms, you can generally expect it to move back towards that average the following season, and then adjust their other stats accordingly.
For Ichiro, he is always prone to a high BABIP due to his unique approach. The infield hits, slaps and bloops all add into this. A one-season deviation would make you skeptical about sustainability, but we have a large enough sample now to know Ichiro gets on base with hits more than anyone and we shouldn't expect that to change.
What this means is, if Ichiro has one of his seasons where he runs a near .400 BABIP, he'll be in serious contention for the bating title.
In his four best BABIP seasons, he won two batting titles and narrowly finished second in the other two.