Diego Costa scored twice as Guus Hiddink's second spell as Chelsea boss started with a draw against Watford.
It could have been more for Hiddink, in charge after Jose Mourinho's sacking, had Oscar not missed a late penalty.
Spaniard Costa hooked in the opener for the Blues before Nemanja Matic's handball allowed Troy Deeney to level from the penalty spot.
Odion Ighalo's deflected shot gave the visitors the lead, only for Costa to fire in and earn Chelsea a point.
Relive Chelsea's draw with Watford
Catch up on all the Premier League reaction
The Blues have won just one of their last five Premier League games and are 15th in the table, just two points above the relegation zone.
Watford's run of four successive victories came to an end, but they remain seventh.
Hiddink, placed in interim charge at Stamford Bridge this week almost seven years after his first stint as manager, should have been celebrating a win upon his return to the champions.
But after Valon Behrami cut down Eden Hazard in the penalty area, Brazilian Oscar slipped on his run up to his 80th-minute penalty and hit the ball against his standing leg, slicing it clear of the crossbar.
But while Chelsea were not as fluid as they were in last week's 3-1 win over Sunderland, overseen by caretaker boss Steve Holland, they will have been buoyed by the return to form of Costa.
With just three Premier League goals this season before the game, he showed the predatory instincts that saw him score 21 times last term - but a late booking means he will be suspended for the trip to Manchester United on Monday.
The 27-year-old opened the scoring by turning to half-volley in from six yards after John Terry knocked down Willian's corner and then timed his run perfectly to take in Willian's superb throughball and angle his shot past Heurelho Gomes for the equaliser.
Costa was one of three players, along with Cesc Fabregas and Oscar, who were berated last week by some Chelsea fans who were convinced the squad had cost Mourinho his job after losing nine of this season's first 16 league games.
But there was an air of positivity around Stamford Bridge, as Hiddink, who led the Blues to victory in the FA Cup final in 2009, was warmly greeted by home supporters.
The Dutchman told his players to look at themselves in the mirror this week, but barely changed the starting line-up, only bringing Gary Cahill in for Kurt Zouma in central defence.
But he seemed to give his full-backs - in particular Branislav Ivanovic - the licence to push forward and add width to his side, as he looks to pull Chelsea away from the drop zone and towards the top four before the end of the season.
Chelsea might have thought they were in for an easy afternoon after dominating possession for the first 15 minutes.
But Watford have won eight times this season after their promotion from the Championship, including last week's 3-0 dismantling of Liverpool, and recovered well to pose a constant threat to the home side.
A lot of their success is down to the forward partnership of Ighalo and Deeney, who held up the ball tremendously and both saw late efforts blocked, as well as a defence that had kept three clean sheets in its last three games.
Their leveller to make it 1-1 was a gift from Chelsea, as Matic got in a mess and handled Ben Watson's corner, allowing Deeney to stroke in his spot-kick for his sixth of the campaign.
And Cahill did not cover himself in glory as he backed off Ighalo, who strode into the area and hit a shot that deflected off the England defender and looped past Thibaut Courtois to give the Nigerian his 29th goal of 2015.
Full Time Match ends, Chelsea 2, Watford 2.
90:00 +4:22 Full timeFull Time Second Half ends, Chelsea 2, Watford 2.
90:00 +3:09Attempt missed. John Obi Mikel (Chelsea) right footed shot from outside the box is close, but misses to the right. Assisted by Willian.
90:00 +2:37 SubstitutionSubstitution Substitution, Watford. Adlène Guédioura replaces Troy Deeney.
90:00 +0:19Attempt blocked. Nemanja Matic (Chelsea) left footed shot from the right side of the box is blocked. Assisted by Branislav Ivanovic.
89:50Gary Cahill (Chelsea) wins a free kick on the right wing.
89:50Foul by Odion Ighalo (Watford).
87:45 BookingBooking Diego Costa (Chelsea) is shown the yellow card for a bad foul.
87:41Foul by Diego Costa (Chelsea).
87:41Craig Cathcart (Watford) wins a free kick in the defensive half.
87:18Attempt blocked. Troy Deeney (Watford) right footed shot from the centre of the box is blocked.
87:16Attempt blocked. Odion Ighalo (Watford) right footed shot from the left side of the box is blocked. Assisted by Troy Deeney.
83:16Offside, Watford. Miguel Britos tries a through ball, but Ikechi Anya is caught offside.
82:06 BookingBooking Valon Behrami (Watford) is shown the yellow card for a bad foul.
81:50César Azpilicueta (Chelsea) wins a free kick in the defensive half.
81:50Foul by Valon Behrami (Watford).
80:25 BookingBooking José Holebas (Watford) is shown the yellow card for a bad foul.
80:17Branislav Ivanovic (Chelsea) wins a free kick in the defensive half.
80:17Foul by José Holebas (Watford).
79:29Penalty missed! Bad penalty by Oscar (Chelsea) right footed shot is too high. Oscar should be disappointed.
Penalty Chelsea. Eden Hazard draws a foul in the penalty area.
78:27Penalty conceded by Valon Behrami (Watford) after a foul in the penalty area.
76:44Foul by Diego Costa (Chelsea).
76:44Craig Cathcart (Watford) wins a free kick in the defensive half.
76:18Attempt missed. Willian (Chelsea) right footed shot from outside the box is too high from a direct free kick.
75:05Willian (Chelsea) wins a free kick in the attacking half.
75:05Foul by Ben Watson (Watford).
74:00 SubstitutionSubstitution Substitution, Chelsea. Eden Hazard replaces Pedro because of an injury.
72:40 SubstitutionSubstitution Substitution, Watford. Ikechi Anya replaces Jurado.
68:23 SubstitutionSubstitution Substitution, Watford. Valon Behrami replaces Almen Abdi.
67:10Attempt missed. Diego Costa (Chelsea) right footed shot from the centre of the box is close, but misses to the left. Assisted by Oscar.
66:35Pedro (Chelsea) wins a free kick in the defensive half.
66:35Foul by Almen Abdi (Watford).
64:37 Goal scoredGoal! Goal! Chelsea 2, Watford 2. Diego Costa (Chelsea) right footed shot from the right side of the box to the bottom left corner. Assisted by Willian with a through ball.
61:42Attempt blocked. Pedro (Chelsea) right footed shot from the centre of the box is blocked. Assisted by Oscar.
59:24Attempt blocked. Nemanja Matic (Chelsea) left footed shot from outside the box is blocked. Assisted by Pedro.
55:48 Goal scoredGoal! Goal! Chelsea 1, Watford 2. Odion Ighalo (Watford) left footed shot from the left side of the box to the bottom left corner. Assisted by Jurado.
55:03Attempt blocked. Etienne Capoue (Watford) right footed shot from the centre of the box is blocked.
55:02Attempt saved. Etienne Capoue (Watford) right footed shot from outside the box is saved in the top centre of the goal.
54:26Foul by John Obi Mikel (Chelsea).
54:26Etienne Capoue (Watford) wins a free kick in the attacking half.
52:58Foul by Diego Costa (Chelsea).
52:58Etienne Capoue (Watford) wins a free kick on the right wing.
49:26Oscar (Chelsea) wins a free kick in the attacking half.
49:26Foul by Etienne Capoue (Watford).
48:47Corner, Chelsea. Conceded by Craig Cathcart.
48:46Attempt blocked. Branislav Ivanovic (Chelsea) right footed shot from a difficult angle on the right is blocked.
48:17Corner, Chelsea. Conceded by Miguel Britos.
47:45 BookingBooking Craig Cathcart (Watford) is shown the yellow card for a bad foul.
47:40Diego Costa (Chelsea) wins a free kick in the defensive half.
47:40Foul by Craig Cathcart (Watford).
47:00Corner, Watford. Conceded by Branislav Ivanovic.
45:00Second Half begins Chelsea 1, Watford 1.
45:00 SubstitutionSubstitution Substitution, Chelsea. John Obi Mikel replaces Cesc Fàbregas.
45:00 +1:11 Half timeHalf Time First Half ends, Chelsea 1, Watford 1.
44:39Attempt missed. Willian (Chelsea) right footed shot from outside the box is too high from a direct free kick.
43:19 BookingBooking Miguel Britos (Watford) is shown the yellow card for a bad foul.
43:06Diego Costa (Chelsea) wins a free kick in the attacking half.
43:06Foul by Miguel Britos (Watford).
41:39 Goal scoredGoal! Goal! Chelsea 1, Watford 1. Troy Deeney (Watford) converts the penalty with a right footed shot to the bottom right corner.
40:42Penalty conceded by Nemanja Matic (Chelsea) with a hand ball in the penalty area.
40:14Corner, Watford. Conceded by Nemanja Matic.
40:10Attempt blocked. Jurado (Watford) right footed shot from outside the box is blocked.
39:04Foul by Gary Cahill (Chelsea).
39:04Odion Ighalo (Watford) wins a free kick in the attacking half.
38:21Attempt missed. Oscar (Chelsea) right footed shot from the centre of the box is too high. Assisted by Branislav Ivanovic.
37:23Corner, Chelsea. Conceded by Miguel Britos.
31:55 Goal scoredGoal! Goal! Chelsea 1, Watford 0. Diego Costa (Chelsea) left footed shot from very close range to the bottom left corner. Assisted by Gary Cahill following a corner.
31:52Attempt blocked. John Terry (Chelsea) header from the centre of the box is blocked. Assisted by Willian with a cross.
31:24Corner, Chelsea. Conceded by Miguel Britos.
29:49Offside, Chelsea. Nemanja Matic tries a through ball, but Pedro is caught offside.
27:32Attempt missed. Almen Abdi (Watford) right footed shot from outside the box is high and wide to the right.
26:45Offside, Chelsea. Cesc Fàbregas tries a through ball, but Pedro is caught offside.
26:38Diego Costa (Chelsea) wins a free kick in the attacking half.
26:38Foul by José Holebas (Watford).
26:04Attempt missed. Odion Ighalo (Watford) right footed shot from outside the box misses to the left. Assisted by Jurado.
22:53Attempt missed. Odion Ighalo (Watford) header from the centre of the box misses to the left. Assisted by Ben Watson with a cross following a corner.
22:11Corner, Watford. Conceded by César Azpilicueta.
19:16Thibaut Courtois (Chelsea) wins a free kick in the defensive half.
19:16Foul by Odion Ighalo (Watford).
17:44Attempt missed. Odion Ighalo (Watford) right footed shot from the centre of the box misses to the left. Assisted by Jurado following a corner.
16:58Corner, Watford. Conceded by Gary Cahill.
14:55Gary Cahill (Chelsea) wins a free kick in the defensive half.
14:55Foul by Odion Ighalo (Watford).
13:20Corner, Chelsea. Conceded by José Holebas.
12:30Attempt blocked. Jurado (Watford) right footed shot from outside the box is blocked.
11:35Hand ball by Jurado (Watford).
10:18Foul by Oscar (Chelsea).
10:18Jurado (Watford) wins a free kick in the defensive half.
9:52Corner, Chelsea. Conceded by Miguel Britos.
9:26Corner, Chelsea. Conceded by Almen Abdi.
8:33Hand ball by Etienne Capoue (Watford).
8:07Corner, Chelsea. Conceded by Odion Ighalo.
7:44Corner, Chelsea. Conceded by Miguel Britos.
7:42Attempt blocked. Willian (Chelsea) right footed shot from outside the box is blocked.
6:12Attempt missed. César Azpilicueta (Chelsea) left footed shot from outside the box misses to the right.
6:01Attempt blocked. Branislav Ivanovic (Chelsea) left footed shot from outside the box is blocked. Assisted by Willian.
4:51Oscar (Chelsea) wins a free kick on the left wing.
4:51Foul by Almen Abdi (Watford).
3:25Attempt missed. Diego Costa (Chelsea) header from very close range is high and wide to the left. Assisted by Pedro with a cross.
0:00First Half begins.
0:00Lineups are announced and players are warming up.
Live data and text provided by our data suppliers