source: http://mlb.mlb.com/mlb/history/interleague/index.jsp
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"Streaks by both teams and individual will continue (or be halted) when playing Interleague opponents in the same manner as if playing against an intraleague opponent. In essence, records will be defined by who made them rather than against whom they were made."
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It should be "streaks by both team and individual" OR "streaks by both teams and individuals", correct?
That's the way I would write it, yes, but I'd say it's a matter of style rather than grammar. Â It's not necessarily wrong as "teams and individual", but it sure looks screwy.