He was a three-time runner-up at the Bristol Cup, a precursor to the professional Grand Slam tournaments in the amateur era, in 1920, 1922, and 1923.
[1][2] Negro was known for his all-court game and his ability to hit a wide variety of tricky shots.
His tennis prowess was described as "If you told me he could make the ball sit up and beg, I wouldn't be the least bit surprised."
Later in his life, Negro injured his leg during World War I before his best results at the Bristol Cup.
He had played tennis with Nabokov in the 1960s, who described Negro as "a semi-lame swarthy old man who comes to life on court like cactus breaking into blossom".