Australian Open: Andy Murray’s fitness woes part of a tennis trend

In the year since the five top-ranked men's players – Andy Murray, Novak Djokovic, Milos Raonic, Stan Wawrinka and Kei Nishikori – arrived in Melbourne with reasonable expectations of challenging for the first grand slam title of the season, the tennis world has been tumble-dried like a 20-foot wave.

Djokovic – once so dominant at the Australian Open – fell in the second round, Murray and Nishikori reached the last 16, Raonic got to the quarters and only Wawrinka reached the semi-finals.

But more significantly in a wider context, not one of them made it as far as the fourth major of 2017, the US Open. If ever there was a statistic to describe the parlous state of modern tennis, it might be that one. And it could be superseded on January 15th, as there is no guarantee any of them will reach the starting line this year or survive without injury over the course of the tournament.

Roger Federer, who is well placed to defend his Australian title and win his 20th major, identified the brutal truth this week when he said of those players struggling to make Melbourne: "Something tells me that probably two guys out of the top five, six that have been injured for a while now probably won't make it, because it seems too many guys are fighting something."

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Murray, who pulled out of the Brisbane International on Tuesday (after the pre-tournament withdrawal of Rafael Nadal – who is still recovering from the knee injury that forced him out of the ATP World Tour Finals in November – and Nishikori), heads the casualty list.

Djokovic who, like Murray, has not played since the ninth day of Wimbledon last year, is probably the next most vulnerable, carrying an elbow injury that refuses to heal; Nishikori, perennially suspect, nurses a sore wrist; Wawrinka has had two operations on his knee – and no warm-up tournaments; and Raonic somehow got on court in Brisbane on Wednesday evening but was beaten in straight sets by the Australian teenager Alex De Minaur.

A glance at their collective tumble through the rankings in only 12 months from the top of the mountain paints a picture of suffering and rolling disappointment. Murray has crashed from No1 to 16; Djokovic, No2 last January, has fallen 10 places; third-placed Raonic is 24th now; Wawrinka has slipped from fourth to ninth; and Nishikori from fifth to 22nd.

Who can be sure where this year's top five – Nadal, Federer, Grigor Dimitrov, Alexander Zverev and Dominic Thiem – will be in a year's time?

Raonic observed in Brisbane this week: “If you look at it from just a purely numbers standpoint, you see the guys that play a lot the year before, a lot of matches, 65-plus, maybe even over 70 matches, those guys struggle the following year.”

It seems the game has finally entered the era of uncertainty that is the lifeblood of any sport – although the route to it is littered with bruised spirits. There are 42 over-30s in the top 100, more than in any year since the rankings began in 1973 – but many of the leading contenders are starting to look their age.

The 2018 Australian Open will almost certainly throw up shocks to match those of a year ago.

(Guardian service)