Riyad Mahrez made the difference as Manchester City cut Arsenal's lead in the Premier League to five points with a 1-0 victory over Chelsea at Stamford Bridge.
The Gunners' goalless draw with Newcastle United on Tuesday opened the door for Pep Guardiola's side to take advantage, though the defending champions were far from their best in the opening period.
Carney Chukwuemeka and Nathan Ake struck the frame of the goal either side of the break, with clear-cut opportunities limited for both sides throughout.
Coming off the bench, Mahrez changed the picture with a 63rd-minute close-range finish that will leave Arsenal looking over their shoulders ahead of what is set to be a significant month.
Chelsea's injury issues were compounded in the opening 20 minutes, losing Raheem Sterling and Christian Pulisic. The latter's issue came after the Blues' first real sight of goal, with the American forward halted by an inch-perfect tackle by John Stones.
Substitute Chukwuemeka had the best opportunity in what was a subdued first half, cutting onto his right foot outside the box and beating Ederson with a low drive that bounced back off the left post.
City boss Guardiola shuffled his deck at the break, introducing Manuel Akanji and Rico Lewis in place of Joao Cancelo and Kyle Walker, which sparked life into the defending champions with Ake heading against the post and Kevin De Bruyne forcing a low save from Kepa Arrizabalaga.
Bernardo Silva's fine footwork crafted another opening, teeing up De Bruyne to fire wide, before further changes followed on the hour mark with the introduction of Jack Grealish and Mahrez.
That pair combined three minutes later, Grealish drilling a pass across the face of goal from the left for Mahrez to tap home with ease.
City held on to secure what could be a valuable win in the title race, while Chelsea were left 10 points adrift of fourth-placed Manchester United in the hunt for Champions League football.
Al-Khaleej 0-1 Al-Nassr: Ronaldo misfires on return as Laporte nets winner
Cristiano Ronaldo returned from suspension but failed to find the net as Al-Nassr secured a 1-0 win over Al-Khaleej on Saturday, with Aymeric Laporte coming up with the decisive goal.
Ronaldo was in action for the first time since being sent off for an elbow in a 2-1 Saudi Super Cup loss to Al-Hilal earlier this month, with his initial two-match ban being reduced to one on appeal.
He missed three good chances as Al-Nassr threatened to fall further behind runaway Saudi Pro League leaders Al-Hilal, but former Manchester City defender Laporte spared his blushes by nodding Marcelo Brozovic's deep free-kick into the bottom-left corner with 68 minutes gone.
Al-Nassr remain nine points adrift of Al-Hilal at the summit in spite of their win, with Jorge Jesus' team unbeaten through 28 games this season as they close in on a record-extending 18th title.
Data Debrief: Ronaldo misfires on return
Ronaldo was presented with the Saudi Pro League's Player of the Month award for March ahead of kick-off, having scored four goals in three league appearances last month.
However, his sights were off on Saturday as he failed to net despite three of the visitors' four big chances, as defined by Opta, falling his way. He led all players on the pitch for expected goals (1.27 xG), shots (five), shots on target (three) and touches in the area (nine) without reward.
Huddersfield all but relegated from Championship while League Two play-off spots decided
Huddersfield Town saw their relegation from the Championship all but confirmed after a 1-1 draw with fellow strugglers Birmingham City on Saturday.
The Terriers avoided a defeat that would have seen them relegated on Saturday, but even a win on the final day over promotion hopefuls Ipswich Town will not be enough unless they overcome a huge goal difference of 15 goals with Plymouth Argyle.
Birmingham remain in the other relegation place and now must beat Norwich City to stand a chance of staying up with Sheffield Wednesday, Plymouth and Blackburn Rovers also still in danger.
At the other end of the table, the Canaries dropped points in a 2-2 draw with Swansea City, leaving the door open for Hull City, who face Ipswich Town later today.
Guardiola: It is a 'dream come true' to be fighting for Premier League title again
Pep Guardiola says it is a "dream come true" to be fighting for the Premier League title once again as his Manchester City side prepare to take on Nottingham Forest at the City Ground on Sunday.
City head into this weekend in second, one point behind leaders Arsenal with a game in hand as Liverpool continue to falter. The Gunners play before Guardiola's men on Sunday, travelling to take on fierce rivals Tottenham, and any slip-up could allow City to move top of the table.
City are on the hunt for a sixth Premier League title in seven seasons, and though Guardiola's men have been in the fight at the summit so often in recent times, the chance to win top-flight silverware again has not lost its appeal.
"Of course, all the teams in the [title race] are tired," Guardiola told reporters. "It's normal at the end of the season.
"But at the same time, it's so exciting. Fighting again for the Premier League? It's a dream come true.
"I could not expect it, honestly. I know always you dream to be there."
At the other end of the table, Forest are fighting for their Premier League lives, a battle not aided by dubious officiating decisions in the 2-0 defeat at Everton last weekend.
The controversial loss leaves Forest heading into their tough fixture this weekend just a point above the drop zone with four games to play.
In his pre-match press conference for the City game, Forest head coach Nuno Espirito Santo was still fuming about the refereeing against the Toffees, saying: "I still can’t quite believe how the decisions went against us.
"It has a big impact as it eventually means points, it means frustration and disappointment. It feels like it’s always against us."
PLAYERS TO WATCH
Nottingham Forest – Morgan Gibbs-White
Gibbs-White has been involved in four goals in his last three Premier League home games (two goals, two assists). Indeed, since Forest's return to the top-flight last season, Gibbs-White has been involved in 19 goals at the City Ground, at least eight more than any other player (eight goals, 11 assists). City will have to keep a watchful eye on the former Wolves man.
Manchester City – Phil Foden
It had already been Foden's best league scoring season of his career before the City youth product netted his 15th and 16th Premier League goals of the campaign to help his side to a 4-0 victory at Brighton on Thursday. He has been absolutely crucial for City this term, and he could be the man to help unlock the Forest door this weekend for another huge three points in the title race.
MATCH PREDICTION – MAN CITY WIN
City are looking to complete their first league double over Forest since the 1999-00 campaign in the second tier, and their first in the top-flight since 1990-91.
However, Forest have lost just three of their last 16 top-flight home games against City (10 wins, three draws), going down 2-0 in 1985, 3-1 in 1990 and 2-0 in 1993.
They have been strong at home of late, too, unbeaten in their last three at the City Ground despite winning just one of their last nine Premier League outings.
It will have to be an almighty effort to topple City, however, especially considering Forest have kept just one clean sheet in their last 23 Premier League games, with that coming via a 2-0 win over West Ham in February.
City have lost both of their Premier League games in the Midlands so far this season, going down 2-1 at Wolves and 1-0 at Aston Villa. However, they last lost three consecutive such visits to the Midlands between March and December 2008, and with the title on the line, it is hard to see past them as strong favourites to pick up the three points on Sunday.
OPTA WIN PROBABILITY
Forest: 10.8%
Man City: 69.3%
Draw: 19.9%
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