it isn t compulsory
这不是强制性的
以上为机器翻译结果，长、整句建议使用 人工翻译 。
And although it isn't a compulsory event, the opposition is of a very high quality, including Novak Djokovic, Rafael Nadal (with a point to prove on his favoured surface) and Robin Soderling, Murray's conqueror in California last month.
BBC: Andy Murray needs points to protect his world ranking
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