although I agree with the overall point paul I think saying tennis players could be squash players is stretching it a bit. Hockey players wouldn't be able to be cricketers and vice versa just because they both hit a ball with stick. Swimmers wouldn't be water polo players, or darts players proficient with a javelin. Mo Farah is, as you say, probably the greatest distance runner of all time. Murray cannot argue the same and although his achievements have been laudable, getting to number one is as much to with Djokovic falling away than Murray being the best out there.If we want to celebrate the best and not just the best now then it should be Farah.
It would mean even more if you could get her name right. 😉