I recently streamed two filmed plays I highly recommend.One is by an emerging young playwright, the other by a seasoned, classical one.This is a pair much like the two protagonists in “The Last Match” by budding writer Anna Ziegler. The Writers Theatre’s production depicts an aging 30-something former American tennis champion engaged in a U.S. Open semifinal match against a young, arrogant and highly competitive Russian player.The second play is from an elderly Englishman who turned 457 last month — a contemporary PBS …