CREATE TABLE table_42305 ("Aces" FLOAT, "Player" TEXT, "Opponent" TEXT, "Year" FLOAT, "Event" TEXT, "Sets" FLOAT, "Result" TEXT)

what year was the memphis event?
SELECT SUM("Year") FROM table_42305 WHERE "Event" = 'memphis'
SELECT SUM("Year") FROM "table_42305" WHERE "Event" = 'memphis'