Replying to myself with this info from wkipedia and now I am really curious as to how fast Gael runs the 100M !
"Monfils was considered an athletics prodigy at school and won the French under-13 and under-14 100m championships. It was only his love for tennis that stopped him going on to compete at a higher level. His coach is on record as saying that Monfils could have made the Olympic 100m final, such was his talent."
Good homework. This would actually explain why Mofils will never win GS. People have "slow" and "fast" muscle fibres. He is used to play 2 sets and going down with time. Definately Monfils is fastest on short distance, but for 3-5 sets best are mix of muscle fibres, would say Đoković would be winner on some Half marathon or even Marathon.
And congrats to Djoker for 3rd title this year. Gael prepared him very well, Cicipas didn't have any chance.
p.S. I would also write, male marathoners (white) are best in 30+ years. While female are best older, almost 34-38. But females dont have so much play (2-3 sets)