Which tennis player won more Grand Slam doubles titles, Peter Fleming or Michael Venus?
Michael Venus (tennis):  He won the final of the 2017 French Open partnering with American Ryan Harrison, and followed that with a runner-up finish in the 2017 US Open mixed doubles with Chan Hao-ching of Chinese Taipei as his partner. Peter Fleming (tennis):  In his doubles partnership with John McEnroe, he won 52 titles, of which seven were at Grand Slams (four at Wimbledon, three at the US Open).
i don't know