Derbyshire have been crowned Division Two champions after securing a six-wicket victory over Hampshire on the final day of the season at the County Ground.
The Falcons went into day four knowing a sixth victory of the season would be enough to clinch the title by virtue of more matches won than title rivals Yorkshire.
Derbyshire took the four remaining Hampshire second-innings wickets before lunch to set themselves a victory target of 196 in front of an expectant crowd.
Overseas signing Usman Khawaja led the run-chase expertly, finishing unbeaten on 72 to go with his 71 in the first innings, while Ross Whiteley (38no) sealed the title with a six.
Hampshire, who will contest the Clydesdale Bank 40 final at Lord's on Saturday, gave themselves a sniff of victory when Derbyshire openers Paul Borrington and Wayne Madsen fell in quick succession before lunch to leave the hosts on 45-2.
But Khawaja took the game away from Hampshire magnificently, striking 12 boundaries and one towering six before Whiteley sealed the club's first piece of silverware since 1993 with a maximum of his own.
Derbyshire celebrated their first ever promotion and will now sets their sights on clinching the Division Two title after edging a tense third day against Hampshire at the County Ground.
Birthday boy Ross Whiteley, 24, struck an unbeaten half-century and then claimed two late wickets to reduce Hampshire to 142-6 in their second innings at stumps - leading by just 139 heading into the final day.
Derbyshire, who must match Yorkshire's result against Essex, will be crowned champions if they can force victory in front of their home fans and the Sky Sports cameras on Friday.
Whiteley played a vital hand with the bat after Usman Khawaja (71) had failed to add to his overnight score. The left-hander scored an undefeated 57 out of 275 to ensure the Falcons picked up two batting points and grabbed a slender three-run first-innings lead.
Openers Michael Carberry and Jimmy Adams both fell early in Hampshire's second knock and when David Wainwright removed first-innings centurion James Vince with a sharp return catch, Hampshire found themselves in trouble on 81-4.
Whiteley went on to snare Sean Ervine and Michael Bates late in the day but Bilal Shafayat (52no) stood firm to give Hampshire hope of denying Derbyshire on day four.
Derbyshire's promotion push was held up by rain at Derby as only 30 overs of play were possible on day two of their critical clash with Hampshire.
Having gone into the final round of fixtures in pole position in Division Two, Derbyshire had boosted their hopes of clinching the title by bowling out their opponents for 272 on the opening day.
They reached 167-5 in reply to leave the match evenly balanced at the halfway stage, though they will hope the weather doesn't continue to intervene.
Resuming on 50-3, Usman Khawaja found an able ally in nightwatchman Tony Palladino to put on a fourth-wicket partnership worth 88.
Palladino plundered eight fours and two sixes to make 58 from 78 deliveries before he was caught by James Tomlinson off the bowling of Sean Ervine, who also dismissed Dan Redfearn soon after for just four.
However Khawaja batted on to reach lunch on 71 not out, pushing the home county a step closer to their first bonus point. There was no play possible during the afternoon, umpires Mark Benson and Steve Gale calling an early end to proceedings.
Derbyshire moved one step closer to securing promotion as they claimed maximum bowling points on day one of their LV= County Championship clash with Hampshire.
James Vince scored 114 to pull Hampshire out of trouble at Derby as the visitors recovered from 59-4 to post 272 all out after being put in to bat, with Derbyshire reaching 50-3 in reply.
Tony Palladino exploited some early movement to strike twice in the first nine overs and eventually finished as the pick of the bowlers with 3-44 while David Wainwright, who wrapped up the innings with two wickets in consecutive balls, claimed 3-69.
Sean Erbvine contributed 61 in a sixth-wicket stand of 136 with Vince, with Michael Bates (29), Jimmy Adams (20) and David Balcombe (20 not out) the only other Hampshire batsmen to make any meaningful contribution.
Derbyshire faced a testing session before the close, though, as they lost three wickets to leave the match finely poised ahead of the second day.
Skipper Wayne Madsen (eight) was caught behind down the leg side, Paul Borrington (four) was snared at gully and Wes Durston edged Chris Wood to second slip in the penultimate over of day. Usman Khawaja finished unbeaten on 27.