Comment by mwhite

Enough of it's luck that it's unlikely that a team would go undefeated for half of a season, but it's also the fact that it's hard to get a team with only the best players; most teams have a mixture of player ability. If you put the best major league team in the minor leagues they'd probably have a 90%+ winning percentage. (Highest MLB season winning percentage is 76%, longest winning streak is 26 games out of 162, including a tie.)