Joselu came off the bench to deny bottom-club Swansea a much-needed victory and earn Newcastle a point from a 1-1 draw at St James' Park
After Newcastle missed a number of chances to take the lead, Jordan Ayew headed Swansea in front on the hour-mark
Joselu levelled for the Magpies in the 68th minute - just four minutes after replacing Dwight Gayle - although the Swans could have stolen all three points in injury-time when Wilfried Bony saw his shot cleared off the line by DeAndre Yedlin
The draw leaves Swansea four points from safety, while Newcastle sit 14th in the Premier League table, three points above the drop zone, and now winless in their last seven league games at home
Gayle twice came close to breaking the deadlock for Newcastle, but he directed a first header straight at Lukasz Fabianski in the Swansea goal before sending a second wide of the mark
Newcastle continued to press for an opener, but Ayoze Perez squandered the best opportunity of the half when firing too close to Fabianski after Matt Ritchie's delightful ball over the top
Swansea saw claims for a penalty turned down before half-time, with referee Graham Scott waving away protests despite Mo Diame appearing to block Mike van der Hoorn's attempt with his elbow
After the break, Gayle sent an effort wide of Fabianski's far post, and Newcastle were made to pay for their missed chances when Swansea struck with 60 minutes on the clock
Ayew's initial header was superbly saved by Karl Darlow, but the rebound fell kindly for the Swansea forward, who made no mistake with his second header
Rafael Benitez responded by replacing Gayle with Joselu, and the move paid off when the forward latched onto a rebound and rolled the ball into the far corner
Swansea substitute Bony could have grabbed the headlines in the third minute of stoppage time, but his low effort was blocked by Yedlin on the line after Darlow had come out to deny Luciano Narsingh
After picking up a yellow card 10 minutes into the match, Bartley looked somewhat cagey for the remainder of the first half, knowing he was one mistake away from an early bath
However, the Swansea captain typified their resolute performance after the break, making a match-high eight clearances, as well as two tackles and one block to deny Newcastle on numerous occasions
"I think we had chances in the first half to score a couple of goals, and then everything could have been different in the second half
"After we conceded, the reaction of the team was positive, and we pushed until the end - although they could have scored on the counter attack
"It's more or less what has happened during the season
 The team has to take their chances, not just the strikers
 If we create, it doesn't matter if it's a winger or a midfielder, we have to be more clinical in front of goal
" "It's impossible from what I saw on the bench
 I would not be honest if I said I saw from the bench
 But of course, you know the technology these days, our assistant said it was a clear penalty
"When I saw in the video, it was a clear penalty because the ball went towards the goal and he opened his arm, in my opinion, the arm is not in a natural positon
"When he opened the arm, it's a clear penalty and red card also
 We are unlucky
"Newcastle travel to Premier League leaders Manchester City in next Saturday's late Premier League kick-off, while Swansea host Wolves in their FA Cup third-round replay on Wednesday before welcoming Liverpool to the Liberty Stadium for  on January 22
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