Tā zài Fǎwǎng shàng ná dào le zhíyè shēngyá dìyīgè dàmǎnguàn guànjūn.
He won his first Grand Slam title at the French Open.
Tips
usage
法网 has two distinct meanings depending on capitalization and context. 法网 (fǎwǎng, lowercase sense) = the net of justice (legal). 法网 (Fǎwǎng, tennis) = the French Open, short for 法国网球公开赛. Context makes it clear.