Postpublished at 13:11 British Summer Time 25 April 2015
So tight is the race for the Premier League that goal difference could play a huge part in deciding who goes up and who has to make do with the play-offs.
Leaders Watford go four points clear
Four clubs chasing automatic promotion
Middlesbrough & Norwich kick-off at 15:00 BST
Second-placed Bournemouth play on Monday
Neil Johnston
So tight is the race for the Premier League that goal difference could play a huge part in deciding who goes up and who has to make do with the play-offs.
BBC Radio 5 live sports extra
Former Brighton defender Guy Butters: "Brighton have had to rely on a couple of long shots, but haven't got the ball into Watford's six-yard box."
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Chris Maguire gives Sheffield Wednesday the lead from the spot in the Yorkshire derby after Lloyd Isgrove was brought down by Sam Byram.
Leeds' Sol Bamba was booked for protesting.
The goal comes against the run of play after Leeds had dominated the first half-hour. Neil Redfearn's side now facing the prospect of their sixth straight defeat.
The half ends with a scare for Watford as Beram Kayal almost diverts a ball pumped into the area into the Watford net. Craig Cathcart just about does enough to put Kayal off.
Two minutes added time. The half is coming to a tame end. Watford don't care. It's a case of job done by the Hornets in the opening 45 minutes.
BBC Radio 5 live sports extra
Former Brighton defender Guy Butters: "Brighton need to switch the ball really quickly. The full-backs are getting space but they need to transfer the ball quicker."
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Best thing about Troy Deeney's goal? The celebration from Watford's Brazilian keeper Heurelho Gomes. Unbridled joy.
Grant, Watford: A precious first-half goal for the Hornets - great finish Deeney and sweet assist by Ighalo
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All the noise coming from the seats populated by yellow shirts. Watford have taken control and are dictating the pace.
Leeds have had the better of the early stages in the Yorkshire derby at Hillsborough. Alex Mowatt had a clear opening after 60 seconds following a mistake by Tom Lees, but Wednesday keeper Keiren Westwood saved. Mowatt has also gone close with a free-kick, while Luke Murphy failed to get enough power on a volley.
Watford's fans are celebrating as though promotion is guaranteed. It's not. Brighton come close to equalising as Chris O'Grady lets fly from 20-yards, Heurelho Gomes producing a magnificent flying save to keep it out. Watford's defence has gone to sleep.
Watford are four points clear in the 'as it stands' table with around 150 minutes of their season remaining. The Premier League is within touching distance.
BBC Radio 5 live sports extra
Former Brighton defender Guy Butters: "You could see it coming, Brighton didn't clear it. The ball went high from Greg Halford's header. Deeney was there with a good finish and there was no chance for David Stockdale.
"It was a tremendous first touch out of his feet and he will not miss from there. But this game sums up Brighton's season. Had lots of possession, not making it count and going behind."
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D-E-E-N-E-Y. Scrappy stuff in the Brighton box as Greg Halford makes a hash of an attempted headed clearance and Odion Ighalo's clever touch allows Troy Deeney to smash home from close range.
Slavisa Jokanovic has seen enough. There are just 25 minutes on the clock but Ikechi Anya's afternoon is over. The midfielder does not look injured as he is replaced by Daniel Tozser. There's a hug for Anya from Jokanovic but the player does not look overly happy about being dragged off.
There's plenty of movement on the Watford bench. Could Slavisa Jokanovic be contemplating an early change? He won't be particularly pleased with what he has seen so far. Greg Halford leaps high above the Hornets defence to head another Brighton chance over.
Happy beside the seaside? Not Watford. It's been uncomfortable for the Premier League hopefuls so far. Brighton are dominating midfield.
Leeds have lost their previous six games but hang on...a big chance for Alex Mowatt to put them ahead in the opening minute at Hillsborough. It's a decent effort but Wednesday keeper Keiren Westwood saves well.
Watford are beginning to assert themselves but are lacking quality in the final third. Juan Carlos Paredes races away and there are three yellow shirts in the Brighton area awaiting his delivery. It's over-hit and a good opportunity is wasted.
Under way in the second early kick-off in the Championship at Hillsborough.