CREATE TABLE table_2186447_1 (partner VARCHAR, score VARCHAR)

How many partners were there when the score was 7 6 (7 4) , 6 3?
SELECT COUNT(partner) FROM table_2186447_1 WHERE score = "7–6 (7–4) , 6–3"
SELECT COUNT("partner") FROM "table_2186447_1" WHERE "7–6 (7–4) , 6–3" = "score"