CREATE TABLE table_30311 ("Year Location" TEXT, "Mens Singles" TEXT, "Womens Singles" TEXT, "Mens Doubles" TEXT, "Womens Doubles" TEXT)

How many players are there for mens singles when chen qi ma lin played mens doubles?
SELECT COUNT("Mens Singles") FROM table_30311 WHERE "Mens Doubles" = 'Chen Qi Ma Lin'
SELECT COUNT("Mens Singles") FROM "table_30311" WHERE "Mens Doubles" = 'Chen Qi Ma Lin'