Name the progressive Active, Career, and Single-Season leaders for each MLB stat. Players are listed once for each interval in which they were the leader, so if they had two non-consecutive intervals for one stat they will be listed twice for that one. Year span as well as that stat for first and last year shown. For example, the active 2B leader from 1872-78 was the leader with 38 in 1872 and led with 123 in 1878.