Venus took 13 of 21 points on 2nd serve against the toughest opponent she 's faced so far in Paris .
In what was a particularly good sign for Venus was her sometimes suspect 2nd serve , her achiles heel on clay .
Venus took 13 of 21 points on 2nd serve against the toughest opponent Venus 's faced so far in Paris .
In what was a particularly good sign for Venus was her sometimes suspect 2nd serve , her achiles heel on clay .