Conversation so far:
what occurred in 1972 to Ken Rosewall?
Rosewall won seven tournaments in 1972, including the depleted Australian Open and became the oldest Grand Slam male singles champion (37 years and 2 months old) in the open era
what was a tournement Ken Rosewall played in?
Rosewall won seven tournaments in 1972, including the depleted Australian Open
who was an opponent of Ken Rosewall?
Ken Rosewall defeated Australia Malcolm Anderson 7–6, 6–3, 7–5
Ken Rosewall did not defeat any opponents?
Ken Rosewall defeated Australia Malcolm Anderson 7–6, 6–3, 7–5
What was Ken Rosewall's performance in the US open?
He lost in the second round of the 1972 U.S. Open against Mark Cox.

Question: what was the score?
Self-contained rewrite: what was the score when Ken Rosewall lost in the second round of the 1972 U.S. Open against Mark Cox?