Owing to the uncertainty of the weather yesterday, the final matches in the interscholastic tennis tournament were postponed until this afternoon. R. Rand, of St. Mark's, will play C. H. Beasley, of Stearns School, at 1.45 o'clock, and the winner of this match will play S. Thayer, of Andover, in the final round for the interscholastic championship at 3.30 o'clock. Both of these matches will be played on Holmes Field.