Brighton eased any fears of relegation with a convincing 2-0 win over Leeds that took them 10 points clear of Fulham in the drop zone.
With only two wins from their past 20 home Premier League matches, Brighton needed a fast start to settle the nerves and got it when Welbeck was fouled inside the area by Ezgjan Alioski. The penalty was coolly converted by Gross.
Leeds, without Kalvin Phillips to injury, lacked the attacking spark to seriously trouble the hosts and Leandro Trossard and Neal Maupay both wasted huge opportunities to take the game away from Marcelo Bielsa's men.
- How the teams lined up | Match stats
- Premier League table | Premier League top scorers
- Get Sky Sports | Get a Sky Sports Pass
Brighton's failure to convert those chances didn't cost them though as Welbeck popped up with the second goal, skilfully making a chance for himself before firing into the bottom corner.
Brighton: Sanchez (7), Burn (8), Webster (7), Dunk (9), Veltman (7), Bissouma (8), Trossard (7), Gross (8), White (7), Welbeck (8), Maupay (6)
Subs: Moder (6)
Leeds: Meslier (7), Ayling (6), Llorente (7), Koch (6), Alioski (5), Struijk (5), Klich (6), Dallas (7), Roberts (6), Harrison (5), Bamford (5)
Subs: Poveda (6), Rodrigo (6)
Man of the match: Lewis Dunk
How wondrous Welbeck sent Seagulls clear...
Leeds kicked off unbeaten in their last six Premier League games, a run which included Manchester City, Manchester United, Liverpool and Chelsea.
- There were ytwo changes for Brighton with Ben White back to face his former club and Dan Burn added to the starting XI
- Robin Koch replaced Kalvin Phillips for Leeds and Mateusz Klich also returned at the expense of Helder Costa, who wasn’t in the squad.
They should have been full of confidence against the flaky Seagulls but stepped off their opponents, allowing them to work their clever passing moves through midfield. Trossard had already tested Illan Meslier twice before Brighton did take the lead from the spot.
Alioski clumsily upended Welbeck in the area and Gross confidently found the bottom left corner with the resultant spot-kick, despite Meslier going the right way.
Leeds improved with the ball but struggled with their final pass against a watertight Brighton back five, led imperiously by Lewis Dunk.
Brighton should have made it 2-0 before the break.
Diego Llorente was dispossessed by Welbeck and, after the ball was worked back across the area, Belgium forward Trossard somehow blazed high and wide with the goal gaping.
With Brighton having dropped 20 points from winning positions this term, head coach Graham Potter would have been concerned to see more chances come and go.
Welbeck flashed a low shot across goal just before the whistle, while Joel Veltman rifled over immediately after the restart. There was no response from Leeds though. Robert Sanchez had little to do with his defence snuffing out most of the danger.
Chances continued to be concentrated at the other end of the field.
White headed onto the roof of the net against his former side, while unmarked Maupay scuffed wide after being expertly teed up by Trossard.
The killer goal did eventually come.
Pascal Struijk hoisted a clearance into the air and, as he went to close down the loose ball, Welbeck expertly whipped it away from him with a deft touch before smashing low across goal into the far corner. The celebrations suggested Brighton knew this was a big result.
Man of the match: Lewis Dunk
An impeccable chest pass back to his goalkeeper Robert Sanchez on 74 minutes triggered a thought: why isn't Gareth Southgate watching Lewis Dunk?
Conor Coady seems to be the likely back-up for John Stones and Harry Maguire at the Euros due to his ability to play at the heart of a back three. But Dunk is equally, if not more, effective at such role judged on his performances in the second half of this season. He is the leader in the best defence of sides in the bottom nine, conceding 39 goals and has kept six clean sheets in their last eight home games.
He was absolutely faultless in this encounter, marking Patrick Bamford out of the game, who failed to have a shot at goal, and repelling everything Leeds mustered in his direction. When you consider the lack of options in the centre of England's defence, how he only has one cap for his country is a mystery.
His manager, Potter, was beaming with his captain, he said: "His performance was sensational. I haven't seen him play as well as that. He's been so consistent at a high level. How he leads the line, he was amazing today."
What the managers said
Brighton boss Graham Potter: "A really good performance that ends in a result. Important to get the second goal. Lots of times this season we've been 1-0 up and not been able to kill the game. A great team performance.
"Having looked at the table, we still need more points. We will keep fighting.
"Danny Welbeck has that quality. He has scored some good goals for us. He has contributed to what we have done on the pitch. He is a Premier League player and he has fantastic attributes as a player and a person.
"It was one of our best performances. You have to match Leeds for their effort and honesty and I felt we did that really well."
Leeds boss Marcelo Bielsa: "In the middle sector of the pitch we were trying to find variety to get in behind them.
"There were very few [chances], that's true. It wasn't because [Patrick Bamford] was isolated. It was because the ball couldn't reach the final third.
"I pay more attention to the construction of our offensive game.
"I think the performance of Robin Koch was positive. I don't link the defeat to the absence of Phillips."
- Brighton have won eight of their last nine league games against Leeds (L1), more than they had in their previous 28 against the Whites (W7 D8 L13).
- Leeds have lost five consecutive away league games against an opponent without scoring for the first time in their history, losing each of their last five visits to Brighton by an aggregate score of 11-0.
- This was Brighton's seventh home clean sheet of the season, with only Manchester City and Chelsea (9 each) keeping more on home soil in the Premier League this term.
- Only Leicester (10) have won more Premier League penalties than Brighton this season (9). Meanwhile, no side given away more (9) or conceded more penalty goals (8) than Leeds.
- Danny Welbeck's five goals in his 21 Premier League games for Brighton this season is his best return in a top-flight campaign since 2017-18 (also 5). He last scored more in a season back in 2013-14 with Manchester United (9).
- Pascal Gross has registered 36 goal involvements in the Premier League (15 goals, 21 assists), at least eight more than any other Brighton player.
- Bamford has failed to score in five consecutive Premier League games for the first time this season.
Brighton have an eight-day break now with their next fixture coming against Wolves next Sunday (12pm kick-off). Meanwhile, Leeds host Tottenham in the early Saturday game next weekend (12.30pm kick-off).