1) Filip Polášek
2) Ivan Dodig
3) David Goffin
4) Daniil Medvedev
Explanation:
The Cincinnati Masters/ Western & Southern Open 2019 was held from August 12-18, 2019 at the Lindner Family Tennis Center in Mason, a northern suburb of Cincinnati, in the United States. It was the 118th men’s edition and the 91st women’s edition. It was the ATP (Association of Tennis Professionals) World Tour Masters 1000 tournament for men with the prize money $6,735,690 and WTA (Women’s Tennis Association) Premier 5 Tournament for women with the prize money $2,944,486.