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The young striker looked on in disbelief as two efforts from six yards in the first half failed to hit the back of the net.
But he made no mistake when the third opportunity arrived at the start of the second half to bag his second goal in two starts and make it eight wins in the reserves last nine games.
The young side on show on a damp night in Derby failed to hit the heights of recent weeks but the winning habit is evident - the was number six on the trot.
They were forced to hang on at times as the Rams pushed forward in second half but Martin Fulop was equal to anything thrown his way, the defence - including debutant Leigh Mills - was solid as a unit and we looked a constant threat on the counter.
The first half wasn't great with Slabber's chances the highlight.
The first arrived after nine minutes after fine work from Eddie Silva Sousa and the returning Rohan Ricketts who pulled back to Slabber from the byline only for the striker to miss the target.
Derby had a couple of efforts from distance but he next chance arrived again to Slabber, again six yards out but this time Lee Grant somehow scooped it off the line.
Where the first half was somewhat scrappy, the second half was electric with a host of chances at both ends and, vitally, Slabber's goal.
Only two minutes had ticked by when Yeates worked a yard of space in the box and cut the ball back for Slabber who lost his marker, spun and finished well.
That sparked a completely different contest with chances at both ends and the home side driven forward in search of an equaliser by Morten Bisgaard.
The Danish international forced a fine save from Fulop, hammered a volley just wide, curled a free-kick just over and then set up Rams best chance for substitute Gianfranco Labarthe Tome that produced a superb double save from Fulop, parrying the first effort away before getting up quickly to block Marcus Tudgay's follow up.
That all came in the space of seven minutes yet in the same time Jamie O'Hara went close twice - it was that sort of game.
The chances continued to come - Rams threw themselves in to block Slabber and Ricketts, Labarthe Tome went close and Slabber grazed the bar with a header from Johnnie Jackson's cross.
Rams came closest to equalising with 14 minutes left as Labarthe Tome volleyed into the ground from a half-cleared corner but with Fulop beaten, Phil Ifil was there clear off the line.
GUIDE TO THE ACTION
9mins: MISS. Wonderful move started by Silva Sousa spreading ball wide to Ricketts and taking the return, laid in Ricketts again who cut the ball back only for Slabber to miss sliding in from six yards.
10mins: Tudgay header at near post from Holmes corner just wide of angle.
17mins: Bisgaard volley from 18 yards, tricky bounce in front of Fulop but took it cleanly.
27mins: Decent volley fromn Barnes from 25 yards but always rising.
31mins: Danger as Barnes flicked on Doyle's long throw and Mills sliced clearance just wide.
39mins: Cassidy won tussle with Defendi, laid ball back for Tudgay to strike wide from 22 yards, should have hit target.
43mins: Cassidy onto Tudgay's flick, cut into box from left channel, low shot into side-netting from 20 yards.
Injury time: SAVE. Yeates tied Doyle in knots, drove ball across the six-yard line, Slabber in there again but Grant somehow managed to keep ball out.
Half-time: Derby County 0, Spurs 0
47mins: GOAL. Yeates worked a yard in box, managed to cut ball back from byline, Slabber shrugged off man, turned and buried from six yards.
Derby County 0, Spurs 1
51mins: SAVE. Bisgaard burst into box onto Doyle's pass, drilled low from 15 yards but Fulop saved with legs.
52mins: Ricketts suddenly room down right flank, crossed deep for O'Hara who opted to shoot when he had support but failed to get hold of effort.
54mins: CLOSE. Bisgaard rocket volley from 25 yards deflected inches wide.
55mins: Bisgaard free-kick from 25 yards close but never on target.
56mins: Ambitious dipping volley attempt from O'Hara from fully 30 yards landed on roof of net.
58mins: DOUBLE SAVE. Labarthe Tome collected Bisgaard's pass in box, escaped marker and forced Fulop into diving save, keeper then up in a flash to throw himself at and block Tudgay's follow up.
67mins: Barnes 30-yarder straight at Fulop.
69mins: Ifil released O'Hara down right flank, beat Boertien, cutback to Slabber to shoot but effort blocked by Martin.
69mins: Martin there again to block as Ricketts let fly in box.
70mins: Labarthe Tome curled just over from 22 yards.
73mins: CLOSE. Jackson's pinpoint cross met by Slabber whose header scraped the top of the crossbar.
76mins: OFF LINE. Ifil there when it mattered to clear Labarthe Tome's goalbound volley.
81mins: Labarthe Tome sliding onto Tudgay's pass but couldn't get enough on effort to trouble Fulop.
88mins: Ricketts shot deflected by Cassidy but Grant alive to tip around post.
Full-time: Derby County 0, Spurs 1
Line-ups: Derby County: Grant, Doyle, Boertien (Nyatanga, 76) Booth (Labarthe Tome, 50), Mills, Martin, Bisgaard, Barnes (Turner, 82), Tudgay, Cassidy, Holmes. Subs: Kirby, Young.
Spurs: Fulop, Ifil, McKie, Defendi, Mills, O'Hara, Jackson, Ricketts, Yeates, Silva Sousa, Slabber. Subs: McKenna, Forecast, Dilevski, Malcolm, Lee.
It was third-time lucky for Jamie Slabber as our reserves maintained their fantastic winning run at Pride Park on Tuesday night to hit the top of the Barclays Premiership Reserve League South table.