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By Mark Ashenden
2018: Five down, three to go. Hopefully the O2 Arena will have mopped up the tears of the world number one this afternoon after Federer lost out to Nikolay Davydenko in three topsy-turvy sets. So who will meet tennis’s equivalent of Cliff Thorburn (Grinder) We’ve got a lanky explosive Argentine who’s rather partial to a vest (and who the heck isn’t) and on bloomin’ fire right now, up against the mighty tireless Sodders aiming to be the first Swede since 1990 (Stefan Edberg) to reach the last two of the ATP Tour World Finals. Thoughts Predictions Kick off at around 2045 GMT. Fancy being part of the build-up