Roger Federer can upset Novak Djokovic at Wimbledon

Roger and Novak will face off again on Sunday, albeit with far less colour this time

It is a match-up that many neutrals would have happily signed up for at the start of the tournament and Alex Johnson thinks the result is not a foregone conclusion.

Two of the biggest names in men's Tennis prepare to do battle in the Wimbledon singles final and it could be a classic.

The experience of Roger Federer and Novak Djokovic proved too much for the young hopefuls in the semi-finals, as Milos Raonic and Grigor Dimitrov were seen off to set up a potential clash to remember.

Djokovic, as the top seed, will go into Sunday's final as the favourite and performances in recent Grand Slams would back that up.

The Serbian has won five titles and has reached five other finals in the last 14 Grand Slam events, an incredible record considering he has faced regular challenges from Federer, Rafael Nadal and Andy Murray.

He has though just one Wimbledon title to his name, that came in 2011, and he hasn't been at the very top of his form so far this year, but has always found a way to grind out a win. The arrival of Boris Becker as coach and advisor appears to have added even more grit and determination to his game.

The world number two needed four sets to defeat Radek Stepanek in round two, five sets to beat Marin Cilic in the quarters and was pushed hard by Dimitrov on Friday.

Those results highlight the fact that Djokovic has needed to dig deep on more than one occasion in the last fortnight and he has been able to find the answers, but his toughest test is likely to come in the final.

Surprisingly, the pair have met on just one previous occasion on grass - that was at Wimbledon in 2012, when Federer came out on top. On that occasion it was a semi-final showdown and the Swiss ace was victorious in four sets, 6-3 3-6 6-4 6-3.

The world number four can also point to seven Wimbledon titles as another factor in his favour heading into the Centre Court showpiece.

Grass is clearly Federer's favourite surface and despite some feeling his Grand Slam time had now been and gone, he appears to have found another dimension.

That could partly be put down to the appointment of another grass-court legend, Stefan Edberg, as his coach. Edberg has got Federer mixing up his game a bit more and we are likely to see regular trips to the net in the final, as he tries to win quicker points with a serve-and-volley ploy.

Federer has dropped just one set in this Championship to date, that was against fellow countryman Stan Wawrinka in the quarter finals, and it's certainly been an impressive run. So much so, it's made some pundits change their mind about the prospects of another Slam for the 32-year-old.

The head-to-head stats also make interesting reading - the pair have met on 34 occasions and Federer leads with 18 wins to Djokovic's 16 successes.

More telling though are the results in this year's three meetings, with Federer winning two of those matches. The Swiss won a last-four encounter in Dubai on hard courts in three sets, before a three-set win on the hard-courts of Indian Wells for Djokovic.

Their most recent meeting came in April, on the clay in Monte Carlo. Not only did Federer win on that occasion, he beat Djokovic in straight sets, 7-5 6-2.

Djokovic may also have mental scars to deal with heading into Sunday's clash, having lost his last three Grand Slam finals - including the straight-sets defeat to Andy Murray at SW19 last year.

The other factor to take into account is the weather - should it rain and the roof be needed, that will lead to even quicker conditions and could play further into Federer's hands, as he seeks a record-breaking eighth Wimbledon title.