Antonio Conte's Premier League winners or Arsene Wenger's massive underachievers- who will win the FA Cup ?
Chelsea are the overwhelming favourites to win at Wembley having strolled to the Premier League title.
Arsenal have problems of their own with a central defence crisis after Lauren Koscielny was sent off against Everton and Gabriel and Shkodran Mustafi injured.
But who are the players set to do battle at the home of English football on its showcase event and how have their seasons gone.
Here we rate the likely starting XIs of Arsenal and Chelsea...
Arsenal
David Ospina
Arsene Wenger is set to pull off a massive shock by selecting Ospina in goal rather than Petr Cech. He's not done too much wrong this season but twice conceding five to Bayern Munich will have dented his confidence and gives him a falsely poor record for the campaign. 5
Rob Holding
A huge game for the youngster to end his first season as a Premier League player - following his move from Bolton last summer. Only 11 goals has been scored when he has been involved this season and that number has been inflated by the four netted by Liverpool on the opening weekend. Injuries and suspensions give him a big chance at Wembley. 6
Per Mertesacker
The huge German has played just 37 minutes of action in the entirety of this season yet will need to be the rock in the Gunners' defence. Whether he can deal with Eden Hazard, Pedro and Diego Costa could decide who will be lifting silverware. The other worry is whether Mertesacker can make it though 90 minutes. 5
Nacho Monreal
Jack of all trades for Wenger's side, with Monreal potentially playing at centre back or left back at Wembley. The Spaniard is a quality player on his day but his occasional lack of defensive concentration can let him down. 6
Hector Bellerin
As an attacking threat Bellerin can puncture a hole in Chelsea's wing-backs but his weakness against Eden Hazard earlier in the season could make him a worry. 6
Granit Xhaka
The walking yellow card's best role would be to man mark Hazard, like Ander Herrera attempted to do earlier in the competition. The German has had a mixed first season at the Emirates but on his day he can be an extremely useful asset. 6
Aaron Ramsey
Not a vintage year for the Welshman with injuries stunting his campaign. There is a worry his career has plateaued slightly in recent seasons but a third FA Cup winners medal could kick him on. 5
Alex Oxlade-Chamberlain
A rare consistency for the Gunners this season. The former Southampton man has impressed when trusted in central midfield although still looks more than a capable of putting in a star show. 7
Mesut Ozil
One of the most frustrating elements in a disappointing season in north London. On his day Ozil can cut sides apart with his incision passing, but more often than not he goes anonymous in the big games. Could be make or break in offering him a deal this summer. 6
Alexis Sanchez
The Chilean is the only world class player available at Wenger's finger tips - in comparison to a whole roster for Conte. His quality is known to everyone and if this is his final appearance in an Arsenal shirt he will be gagging to make it a good one. The Chilean has carried the Gunners for large swathes of the season, can he turn it on one final time. 9
Oliver Giroud
The Frenchman will likely get the nod over Danny Welbeck, who flopped his audition against Everton. 16 goals for the season is nothing to sneer at but the worry has always been he is at his best in the smaller games. 6
Chelsea
Thibaut Courtois
The wall at the back of the heavily well guarded Chelsea goal. Courtois makes very few errors especially when the pressure is on. Arsenal will have to take their chances to beat him. 8
Victor Moses
Huge surprise package of the season, from wondering loan man to important clog in Conte's formation change. His wing-back role is become a trademark with his iron lungs. 7
Cesar Azpilicueta
Mr Consistent. The Spanish ace is quickly becoming the new Branislav Ivanovic. He didn't miss a single Premier League match in their title blitz, had a ludicrously high pass success rate and it is hard to remember him putting a foot wrong. Probably deserves the double the most. 9
David Luiz
Playstation footballer no more. Luiz has comeback to Stamford Bridge with a newly found maturity on the pitch and a strong head off it. Can he show off his new lease of trustworthiness at Wembley? 7
Gary Cahill
He ended the season a rock but after losing 3-0 to Arsenal right at the beginning of the season his place was in jeopardy but the formation switch and a bigger role in central defence as seen him excel. Solid and a mainstay in defence. 8
Marcos Alonso
Not the player Bolton and Sunderland fans will remember from his poor spells with them. The Spanish star is one of the best wing-backs in the world, with his attacking and defending equally skilled. 8
Nemanja Matic
The forgotten man in some respects with N'Golo Kante earning the headlines. He's linked up well with the Frenchman and handed the Blues a policeman in front of the back four. Matic's goal in the semi-final was a stunning strike. 7
N'Golo Kante
Kante is everywhere, quite literally. The superlatives keep on spilling out for the midfielder and without him the walk to the title could have been much harder. Wins everything he touches. 9
Eden Hazard
The Belgian is the biggest game changer in the Premier League. Unstoppable when on his A-game. The worry is if Arsenal do a man-marking job on him to stunt him. 9
Pedro
The three at the back formation gave Pedro the life he needed in the side, as it gave him freedom. Lucky Willian dropped out of the side with a family bereavement, but more than took his chance. 7
Diego Costa
Likely to be his final match for the Blues and will be a sad miss. Bullies players like very few others. His influence in goals is much more than just scoring them. Against a weakened Gunners back line he could be lethal. 8