Originally posted on 05/31/2017:

If the line was -1.5 +180, I believe you should be betting on Zhang Shuai -1.5 Sets, it means that she must need to win 2-0 in sets for your bet to win. (In women tennis, it is always best of 3 sets, so 2-0 or 2-1 outcome only.)
But the result of the match was Zhang Shuai winning 2-1 in sets, so that's why you lost this bet.

But yea, if you were betting on Zhang Shuai -1.5 Games instead, she would help you win the bet, because she won 16 games and the opponent won 11 games, 5 games difference.