CREATE TABLE table_28138035_4 (mens_doubles VARCHAR, mens_singles VARCHAR)

Name the mens doubles for dimitrij ovtcharov
SELECT mens_doubles FROM table_28138035_4 WHERE mens_singles = "Dimitrij Ovtcharov"
SELECT "mens_doubles" FROM "table_28138035_4" WHERE "Dimitrij Ovtcharov" = "mens_singles"